JAGUAR ANIMAL HEALTH, INC. FORM OF WARRANT TO PURCHASE COMMON STOCK

Exhibit 10.25

THIS WARRANT AND ANY COMMON STOCK ISSUED UPON THE EXERCISE OF THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS, AND MAY NOT BE OFFERED, SOLD, OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM, AS EVIDENCED BY A LEGAL OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY TO SUCH EFFECT. NOTWITHSTANDING THE FOREGOING, THIS WARRANT AND THE COMMON STOCK ISSUABLE UPON EXERCISE OF THIS WARRANT MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN OR FINANCING ARRANGEMENT SECURED BY ANY SUCH SECURITIES.

JAGUAR ANIMAL HEALTH, INC.

FORM OF WARRANT TO PURCHASE COMMON STOCK

JAGUAR ANIMAL HEALTH, INC., a Delaware corporation (the “Company”), hereby certifies that, for value received,                           , or its permitted assigns (the “Holder”), is entitled to purchase from the Company such number of shares of common stock, par value $0.0001 per share (the “Common Stock”) of the Company (each a “Warrant Share”, and collectively, the “Warrant Shares”) as determined by dividing $                       by the gross purchase price that shares of Common Stock are sold to the public in the Company’s initial public offering that closes within thirty (30) following the Original Issue Date (the “IPO”), as further adjusted from time to time as provided in Section 9 herein (the “Exercise Price”), at any time and from time to time commencing on the date six (6) months following the closing of the IPO (the “Commencement Date”), and through and including the earlier to occur of (x) 5:00 P.M., New York City time, on the fifth anniversary of the Original Issue Date, and (y) 5:00 P.M. New York City time on the date immediately prior to a “Liquidation Event” (as defined below) (the earliest of (x) and (y) shall be, the “Expiration Date”), subject to the following terms and conditions:

1.                                       Definitions.  In addition to the terms defined elsewhere in this Warrant, the following terms shall have the following meanings:

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Securities and Exchange Commission promulgated thereunder.

“Liquidation Event” means (x) the closing of a merger, reorganization, tender offer or similar transaction involving the Company or its securities with or into another entity in which the holders of voting securities of the Company immediately prior to such transaction will hold less than 50% of the voting securities of the surviving entity immediately following such transaction as a result of shares held prior to such transaction and (y) the closing of a sale of all or substantially all of the assets of the Company.

“Person” means an individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof.

“Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations of the Securities and Exchange Commission promulgated thereunder.

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2.                                        Registration of Warrant. The Company shall register this Warrant, upon records to be maintained by the Company for that purpose (the “Warrant Register”), in the name of the record Holder (which shall include the initial Holder or, as the case may be, any registered assignee to which this Warrant is permissibly assigned hereunder) from time to time. The Company may deem and treat the registered Holder as the absolute owner hereof for the purpose of any exercise hereof or any distribution to the Holder, and for all other purposes, absent actual notice to the contrary.

3.                                       Transfers. The Company need not register a transfer of this Warrant unless the conditions specified in the legend on the front page hereof are satisfied and the transferee has agreed in writing to be subject to the terms and conditions of this Warrant, including transferee acknowledging in writing that it meets the investor suitability criteria set forth in this Warrant and Exhibit C attached hereto. The registered Holder of this Warrant agrees by his, her or its acceptance hereof, that neither this Warrant nor any Warrant Shares issued upon exercise of this Warrant shall be sold, transferred, assigned, pledged or hypothecated by any Person prior to the Commencement Date. On or after the Commencement Date, transfer of this Warrant may be made, subject to the restrictions on transfer set forth in this Warrant and compliance with all applicable securities laws and the Company shall register the transfer of all or any portion of this Warrant in the Warrant Register, upon surrender of this Warrant, with the Form of Assignment (an “Assignment”) attached as Exhibit A hereto duly completed and signed, to the Company at its address specified in Section 13. No ink original of any Assignment shall be required, nor shall any medallion guarantee (or other type of guarantee or notarization) of any Assignment be required. Upon any such registration or transfer, a new warrant to purchase Common Stock in substantially the form of this Warrant (any such new warrant, a “New Warrant”) evidencing the portion of this Warrant so transferred shall be issued to the transferee, and a New Warrant evidencing the remaining portion of this Warrant not so transferred, if any, shall be issued to the transferring Holder. The acceptance of the New Warrant by the transferee thereof shall be deemed the acceptance by such transferee of all of the rights and obligations of a Holder of a Warrant.

4.                                       Exercise and Duration of Warrant.

(a)          Subject to Holder executing and complying with Exhibit C and Section 17 below, all or any part of this Warrant shall be exercisable, in whole or in part, by the registered Holder at any time and from time to time on or after the Commencement Date and through and including 5:00 p.m., New York City time, on the Expiration Date. At 5:00 p.m., New York City time, on the Expiration Date, this Warrant shall be terminated and no longer outstanding; provided, however that, notwithstanding anything to the contrary provided in this Section 4(a) or elsewhere, without any further action by or on behalf of the Holder, this Warrant shall automatically be deemed to be exercised in full pursuant to the net exercise provisions of Section 10 effective immediately prior to such termination.

(b)          The Holder may exercise this Warrant, not later than 5:00 p.m., New York City time, on any Business Day following the Commencement Date and prior to the Expiration Date, by delivering to the Company (i) an exercise notice, in the form attached as Exhibit B hereto (the “Exercise Notice”), appropriately completed and duly signed, (ii) the Investment Representation Statement in the form attached as Exhibit C hereto duly signed and (iii) payment of the Exercise Price for the number of Warrant Shares as to which this Warrant is being exercised (which may take the form of a “cashless exercise” if so indicated in the Exercise Notice and if a “cashless exercise” may occur at such time pursuant to Section 10), and the date such items are delivered to the Company (as determined in accordance with the notice provisions hereof) is an “Exercise Date.” If the Exercise Notice is received by the Company after 5:00 p.m., New York City time, on the specified Exercise Date, this Warrant will be deemed to be received and exercised on the Trading Day next succeeding the Exercise Date. The Holder shall not be required to deliver the original Warrant in order to effect an exercise hereunder. Execution and delivery of the Exercise Notice shall have the same effect as cancellation of the original Warrant and

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issuance of a New Warrant evidencing the right to purchase the remaining number of Warrant Shares. No ink original of any Exercise Notice shall be required, nor shall any medallion guarantee (or other type of guarantee or notarization) of any Exercise Notice be required.

5.                                       Delivery of Warrant Shares.

(a)          Subject to Section 11 below, upon exercise of this Warrant, the Company shall promptly (but in no event later than three Trading Days (as defined below) after the Exercise Date) issue or cause to be issued and cause to be delivered to or upon the written order of the Holder and in such name or names as the Holder may designate, a certificate for the Warrant Shares issuable upon such exercise free of restriction legends if so eligible under the federal securities laws and such exercise occurs on or following the Commencement Date.  The Holder, or any Person permissibly so designated by the Holder to receive Warrant Shares, shall be deemed to have become the holder of record of such Warrant Shares as of the Exercise Date. If the Warrant Shares are eligible to be issued free of all restrictive legends in accordance with the federal securities laws and the terms and conditions of this Warrant, in lieu of delivering physical certificates representing the Warrant Shares issuable upon exercise, provided the Company’s transfer agent is participating in The Depository Trust Company’s Fast Automated Securities Transfer program, upon the written request of the Holder, the Company shall use its best efforts to deliver, or cause to be delivered, Warrant Shares hereunder electronically through The Depository Trust Company or another established clearing corporation performing similar functions, if available. “Trading Day” means any day on which the shares of Common Stock are traded on the NASDAQ Stock Market, or, if the NASDAQ Stock Market is not the principal trading market for the Common Stock, then on the principal securities exchange or securities market on which the Common Stock are then traded;  provided that “Trading Day” shall not include any day on which the Common Stock are scheduled to trade on such exchange or market for less than 4.5 hours or any day that the Common Stock are suspended from trading during the final hour of trading on such exchange or market (or if such exchange or market does not designate in advance the closing time of trading on such exchange or market, then during the hour ending at 4:00:00 p.m., New York time).

(b)          If by the close of the third Trading Day after delivery of a properly completed Exercise Notice (and any other documents required pursuant to Section 5(a)), the Company fails to deliver to the Holder the required number of Warrant Shares in the manner required pursuant to Section 5(a), and if on or after the Trading Day immediately following such third Trading Day and prior to the receipt of such Warrant Shares, the Holder purchases (in an open market transaction or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the Holder of the Warrant Shares which the Holder anticipated receiving upon such exercise (a “Buy-In”), then the Company shall, within three Trading Days after the Holder’s request and in the Holder’s sole discretion, either (i) pay in cash to the Holder an amount equal to the Holder’s total purchase price (including brokerage commissions, if any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s obligation to deliver such certificate (and to issue such Warrant Shares) shall terminate or (ii) promptly honor its obligation to deliver to the Holder Warrant Shares and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of Warrant Shares, times (B) the Closing Sales Price (as defined below) on the date of receipt of a properly completed Exercise Notice.

(c)          To the extent permitted by law, the Company’s obligations to issue and deliver Warrant Shares in accordance with the terms hereof are absolute and unconditional, irrespective of any action or inaction by the Holder to enforce the same, any waiver or consent with respect to any provision hereof, the recovery of any judgment against any Person or any action to enforce the same, or any setoff, counterclaim, recoupment, limitation or termination, or any breach or alleged breach by the Holder or any other Person of any obligation to the Company or any violation or alleged violation of law by the Holder

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or any other Person, and irrespective of any other circumstance which might otherwise limit such obligation of the Company to the Holder in connection with the issuance of Warrant Shares. Nothing herein shall limit the Holder’s right to pursue any other remedies available to the Holder hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver Common Stock upon exercise of this Warrant as required pursuant to the terms hereof.

6.                                       Charges, Taxes and Expenses.  Issuance and delivery of certificates for shares of Common Stock upon exercise of this Warrant shall be made without charge to the Holder for any issue or transfer tax, transfer agent fee or other incidental tax or expense in respect of the issuance of such certificates, all of which taxes and expenses shall be paid by the Company; provided, however, that the Company shall not be required to pay any tax which may be payable in respect of any transfer involved in the registration of any certificates for Warrant Shares or Warrants in a name other than that of the Holder or an affiliate thereof. The Holder shall be responsible for all other tax liability that may arise as a result of holding or transferring this Warrant or receiving Warrant Shares upon exercise hereof.

7.                                       Replacement of Warrant.  If this Warrant is mutilated, lost, stolen or destroyed, the Company shall issue or cause to be issued in exchange and substitution for and upon cancellation hereof, or in lieu of and substitution for this Warrant, a New Warrant, but only upon receipt of evidence reasonably satisfactory to the Company of such loss, theft or destruction (in such case) and, in each case, a customary and reasonable indemnity (which shall not include a surety bond), if requested. Applicants for a New Warrant under such circumstances shall also comply with such other reasonable regulations and procedures. If a New Warrant is requested as a result of a mutilation of this Warrant, then the Holder shall deliver such mutilated Warrant to the Company as a condition precedent to the Company’s obligation to issue the New Warrant.

8.                                       Reservation of Warrant Shares.  The Company covenants that it will reserve and keep available out of the aggregate of its authorized but unissued and otherwise unreserved shares of Common Stock, solely for the purpose of enabling it to issue Warrant Shares upon exercise of this Warrant as herein provided, one hundred percent (100%) of the number of Warrant Shares that are issuable and deliverable upon the exercise of this entire Warrant, free from preemptive rights or any other contingent purchase rights of persons other than the Holder (taking into account the adjustments and restrictions of Section 9). The Company covenants that all Warrant Shares so issuable and deliverable shall, upon issuance and the payment of the applicable Exercise Price in accordance with the terms hereof, be duly and validly authorized, issued and fully paid and nonassessable. The Company will take all such action as may be necessary to assure that such shares of Common Stock may be issued as provided herein without violation of any applicable law or regulation, or of any requirements of any securities exchange or automated quotation system upon which the Common Stock may be listed.

9.                                       Certain Adjustments. At such time that the fixed Exercise Price has been established under this Warrant, the Exercise Price and number of Warrant Shares issuable upon exercise of this Warrant are subject to adjustment from time to time as set forth in this Section 9 as follows:.

(a)          Stock Dividends and Splits. If the Company, at any time while this Warrant is outstanding after the fixed Exercise Price has been established, (i) pays a stock dividend on its Common Stock or otherwise makes a distribution on any class of capital stock that is payable in shares of Common Stock, (ii) subdivides its outstanding shares of Common Stock into a larger number of shares, or (iii) combines its outstanding shares of Common Stock into a smaller number of shares, then in each such case the Exercise Price shall be multiplied by a fraction, the numerator of which shall be the number of shares of Common Stock outstanding immediately before such event and the denominator of which shall be the number of shares of Common Stock outstanding immediately after such event. Any adjustment made

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pursuant to clause (i) of this paragraph shall become effective immediately after the record date for the determination of stockholders entitled to receive such dividend or distribution, and any adjustment pursuant to clause (ii) or (iii) of this Section 9(a) shall become effective immediately after the effective date of such subdivision or combination.

(b)          Pro Rata Distributions.  After the fixed Exercise Price has been established, if the Company, at any time while this Warrant is outstanding, distributes to all holders of Common Stock (i) evidences of its indebtedness, (ii) any security (other than a distribution of Common Stock covered by the preceding paragraph), (iii) rights or warrants to subscribe for or purchase any security, or (iv) any other asset (in each case, “Distributed Property”), then, upon any exercise of this Warrant that occurs after the record date fixed for determination of stockholders entitled to receive such distribution, the Holder shall be entitled to receive, in addition to the Warrant Shares otherwise issuable upon such exercise (if applicable), the Distributed Property that such Holder would have been entitled to receive in respect of such number of Warrant Shares had the Holder been the record holder of such Warrant Shares immediately prior to such record date.

(c)           Reclassifications. In case of any reclassification or change of the Common Stock (other than a change in par value, or as a result of a subdivision or combination or dividend or as otherwise as adjusted under this Sectionn 9), the Company shall execute a new Warrant, providing that the holder of this Warrant shall have the right to exercise such new Warrant, and procure upon such exercise and payment of the same aggregate Exercise Price, in lieu of the shares of Common Stock theretofore issuable upon exercise of this Warrant, the kind and amount of shares of stock, other securities, money and property receivable upon such reclassification or change by a holder of an equivalent number of shares of Common Stock.  Such new Warrant shall provide for adjustments which shall be as nearly equivalent as may be practicable to the adjustments provided for in this Section 9.  Except for a Liquidation Event, the provisions of this subsection (c) shall similarly apply to successive reclassifications and changes.

(d)          Number of Warrant Shares.  Simultaneously with any adjustment to the Exercise Price pursuant to this Section 9, the number of Warrant Shares that may be purchased upon exercise of this Warrant shall be increased or decreased proportionately, so that after such adjustment the aggregate Exercise Price payable hereunder for the increased or decreased number of Warrant Shares shall be the same as the aggregate Exercise Price in effect immediately prior to such adjustment.

(e)          Calculations.  All calculations under this Section 9 shall be made to the nearest cent or the nearest share, as applicable. The number of shares of Common Stock outstanding at any given time shall not include shares owned or held by or for the account of the Company, and the sale or issuance of any such shares shall be considered an issue or sale of Common Stock.

(f)          Notice of Adjustments.  Upon the occurrence of each adjustment pursuant to this Section 9, the Company at its expense will, at the written request of the Holder, promptly compute such adjustment, in good faith, in accordance with the terms of this Warrant and prepare a certificate setting forth such adjustment, including a statement of the adjusted Exercise Price and adjusted number or type of Warrant Shares or other securities issuable upon exercise of this Warrant (as applicable), describing the transactions giving rise to such adjustments and showing in detail the facts upon which such adjustment is based. Upon written request, the Company will promptly deliver a copy of each such certificate to the Holder and to the Company’s transfer agent.

(g)          Notice of Corporate Events.  If, while this Warrant is outstanding, the Company (i) declares a dividend or any other distribution of cash, securities or other property in respect of its Common Stock, including, without limitation, any granting of rights or warrants to subscribe for or purchase any capital stock of the Company or any subsidiary, (ii) authorizes or approves, enters into any

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agreement contemplating or solicits stockholder approval for a Liquidating Event, or (iii) authorizes the voluntary dissolution, liquidation or winding up of the affairs of the Company, then, except if such notice and the contents thereof shall be deemed to constitute material non-public information, the Company shall deliver to the Holder a notice describing the material terms and conditions of such transaction at least five Trading Days prior to the applicable record or effective date on which a Person would need to hold Common Stock in order to participate in or vote with respect to such transaction, and the Company will take all steps reasonably necessary in order to ensure that the Holder is given the practical opportunity to exercise this Warrant prior to such time so as to participate in or vote with respect to such transaction; provided, however, that the failure to deliver such notice or any defect therein shall not affect the validity of the corporate action required to be described in such notice.

10.                                Payment of Exercise Price.  The Holder shall pay the Exercise Price in immediately available funds; provided, however, that the Holder may, in its sole discretion, satisfy its obligation to pay the Exercise Price through a “cashless exercise,” in which event the Company shall issue to the Holder the number of Warrant Shares determined as follows:

X = Y [(A-B)/A]

where:

X = the number of Warrant Shares to be issued to the Holder.

Y = the total number of Warrant Shares with respect to which this Warrant is being exercised in accordance with the terms of this Warrant if such exercise were by means of a cash exercise rather than a cashless exercise.

A = the average of the Closing Sale Prices of the shares of Common Stock (as reported by Bloomberg Financial Markets) for the five Trading Days ending on the date immediately preceding the Exercise Date.

B = the Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise.

For purposes of this Warrant, “Closing Sale Price” means, for any security as of any date, the last trade price for such security on the principal trading market of the security, as reported by Bloomberg Financial Markets, or, if the principal trading market of the security begins to operate on an extended hours basis and does not designate the last trade price then the last trade price of such security prior to 4:00 p.m., New York City Time, as reported by Bloomberg, Financial Markets, or if the foregoing do not apply, the last trade price of such security in the over-the-counter market on the electronic bulletin board for such security as reported by Bloomberg Financial Markets, or, if no closing bid price is reported for such security by Bloomberg Financial Markets, the average of the bid prices and asked prices of any market makers for such security as reported in the “pink sheets” by OTC Markets Group Inc. If the Closing Sale Price cannot be calculated for a security on a particular date on any of the foregoing bases, the Closing Sale Price of such security on such date shall be the fair market value as mutually determined by the Company and the Holder in good faith. If the Company and the Holder are unable to agree upon the fair market value of such security, then the Company shall, within two business days submit via facsimile (a) the disputed determination of the Exercise Price to an independent, reputable investment bank selected by the Company and approved by the Holder (which approval shall not be unreasonably withheld, conditioned or delayed) or (b) the disputed arithmetic calculation of the Warrant Shares to the Company’s independent, outside accountant. The Company shall cause at its expense the investment bank or the accountant, as the case may be, to perform the determinations or calculations and notify the

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Company and the Holder of the results no later than ten business days from the time it receives the disputed determinations or calculations. Such investment bank’s or accountant’s determination or calculation, as the case may be, shall be binding upon all parties absent demonstrable error. All such determinations shall be appropriately adjusted for any stock dividend, stock split, stock combination or other similar transaction during the applicable calculation period.

11.                                Beneficial Ownership.

a.              Except as provided elsewhere in this Section 11(a)  the Company shall not effect the exercise of this Warrant and the Holder shall not have the right to (a) exercise this Warrant into Warrant Shares but only to the extent that the number of Warrant Shares to be issued pursuant to such exercise would result, when aggregated with all other shares of Common Stock beneficially owned by such Holder at such time, in such Holder beneficially owning more than 4.99% of all of the Common Stock issued and outstanding at such time (the “4.99% Limitation”); provided, however, that upon the Holder providing the Company with sixty one (61) days prior written notice (the “4.99% Waiver Notice”) that such Holder is waiving this Section with regard to any or all Warrant Shares issuable upon exercise of this Warrant, this Section 11(a) shall be of no force or effect with regard to those Warrant Shares referenced in the 4.99% Waiver Notice.

b.              Except as provided elsewhere in this Section 11(b) the Holder shall not have the right to exercise this Warrant into Warrant Shares but only to the extent that the number of Warrant Shares to be issued pursuant to such exercise would result, when aggregated with all other shares of Common Stock beneficially owned by such Holder at such time, in such Holder beneficially owning in excess of 9.99% of all of the shares of Common Stock issued and outstanding at such time (the “9.99% Limitation”); provided, however, that upon the Holder providing the Company with sixty one (61) days prior written notice (the “9.99% Waiver Notice”) that the Holder is waiving this Section 11(b) with regard to any or all Warrant Shares issuable upon exercise of this Warrant, this Section 11(b) shall be of no force or effect with regard to those Common Stock referenced in the 9.99% Waiver Notice.

c.               For purposes of this Section 11, beneficial ownership shall be calculated in accordance with Section 13(d) of the Exchange Act taking into account the 4.99% Limitation and the 9.99% Limitation, as the case may be, and analogous provisions in and/or relevant to any other securities of the Company beneficially owned by the Holder. For purposes of this Warrant, in determining the number of outstanding shares of Common Stock, the Holder may rely on the number of outstanding shares of Common Stock as reflected in the most recent of (i) the Company’s most recent Form 10-K, Form 10-Q, Current Report on Form 8-K or other public filing with the Securities and Exchange Commission, as the case may be, (ii) a more recent public announcement by the Company or (iii) any other notice by the Company or the transfer agent setting forth the number of shares of Common Stock outstanding. For any reason at any time, upon the written or oral request of the Holder, the Company shall within two (2) business day confirm to the Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the conversion or exercise of securities of the Company, including this Warrant, by the Holder and its affiliates since the date as of which such number of outstanding shares of Common Stock was reported. For purposes of this Warrant, “Person” means an individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof.

12.                                No Fractional Shares. No fractional Warrant Shares will be issued in connection with any exercise of this Warrant. In lieu of any fractional shares which would, otherwise be issuable, the number of Warrant Shares to be issued shall be rounded down to the next whole number and the Company shall pay the Holder in cash the fair market value (based on the Closing Sale Price) for any

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such fractional shares.

13.                                Notices.  All notices, requests, consents and other communications under this Warrant shall be in writing and shall be deemed to have been duly made when hand delivered, or mailed by express mail or private courier service: (i) if to the registered Holder of this Warrant, to the address of such Holder as shown on the Warrant Register, or (ii) if to the Company to the following address or to such other address as the Company may designate by notice to the Holder(s):

Jaguar Animal Health, Inc.

Attn: CFO

185 Berry Street — Suite 1300

San Francisco, CA 94107

14.                                Warrant Agent. The Company shall initially serve as warrant agent under this Warrant. Upon thirty days’ notice to the Holder, the Company may appoint a new warrant agent. Any corporation into which the Company or any new warrant agent may be merged or any entity resulting from any consolidation to which the Company or any new warrant agent shall be a party or any corporation to which the Company or any new warrant agent transfers substantially all of its corporate trust or stockholders services business shall be a successor warrant agent under this Warrant without any further act. Any such successor warrant agent shall promptly cause notice of its succession as warrant agent to be mailed (by first class mail, postage prepaid) to the Holder at the Holder’s last address as shown on the Warrant Register.

15.                               Restrictive Legends.

a.              The Warrant Shares issuable upon exercise of this Warrant (unless registered under the Securities Act of 1933, as amended (the “Securities Act”)) or eligible to be issued free of all restrictive legends in accordance with applicable state and federal securities laws and the terms and conditions of this Warrant, shall be stamped or imprinted with legends in substantially the following form:

THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED SOLELY FOR INVESTMENT AND THE OFFER AND SALE OF SUCH SHARES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR ANY STATE SECURITIES LAWS.  SUCH SHARES MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF SUCH REGISTRATION OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY AND ITS COUNSEL THAT SUCH SALE, OFFER, PLEDGE OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF THE ACT AND OF ANY APPLICABLE STATE SECURITIES LAWS.  COPIES OF THE AGREEMENT COVERING THE PURCHASE OF THESE SHARES AND RESTRICTING THEIR TRANSFER MAY BE OBTAINED AT NO COST BY WRITTEN REQUEST MADE BY THE HOLDER OF RECORD OF THIS CERTIFICATE TO THE SECRETARY OF THE CORPORATION AT THE PRINCIPAL EXECUTIVE OFFICES OF THE CORPORATION.

THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS ON TRANSFER FOR A PERIOD OF TIME FROM THE EFFECTIVE DATE OF THE CORPORATION’S FIRST UNDERWRITTEN PUBLIC OFFERING AS MORE FULLY PROVIDED IN THE WARRANT TO WHICH THESE SECURITIES WERE ISSUED.

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b.              The Company need not register a transfer of Warrant Shares bearing the restrictive legends set forth in this Section 15, unless the conditions specified in such legends are satisfied.  The Company may also instruct its transfer agent not to register the transfer of the Warrant Shares, unless all of the conditions specified in the legends set forth in this Section 15 are satisfied.

16.                               Market Standoff.  In connection with the IPO, and upon request of the Company or the underwriters managing such offering of the Company’s securities, Holder (and any assignee)  hereby agrees not to sell, make any short sale of, loan, grant any option for the purchase of, or otherwise dispose of any securities of the Company (other than those included in the registration) without the prior written consent of the Company or such underwriters, as the case may be, for such period of time (not to exceed 180 days) from the effective date of such registration as may be requested by the Company or such managing underwriters and to execute an agreement reflecting the foregoing as may be requested by the underwriters at the time of the Company’s initial public offering.  In addition, upon request of the Company or the underwriters managing a public offering of the Company’s securities (other than the initial public offering), Holder hereby agrees to be bound by similar restrictions, and to sign a similar agreement, in connection with no more than one additional registration statement filed within 12 months after the closing date of the initial public offering, provided that the duration of the lock-up period with respect to such additional registration shall not exceed 90 days from the effective date of such additional registration statement.  Notwithstanding the foregoing, if during the last 17 days of the restricted period, the Company issues an earnings release or material news or a material event relating to the Company occurs, or prior to the expiration of the restricted period the Company announces that it will release earnings results during the 16-day period beginning on the last day of the restricted period, then, upon the request of the managing underwriter, to the extent required by any FINRA rules, the restrictions imposed by this subsection shall continue to apply until the end of the third trading day following the expiration of the 15-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event.  In no event will the restricted period extend beyond 216 days after the effective date of the registration statement and in no event shall Holders lock-up period as provided herein be any longer than the shortest lock-up period agreed to by any other holder of Company securities.  Notwithstanding anything to the contrary, provided herein, or elsewhere, this Section 16 shall only apply to the Warrant Shares if all other warrants and options of the Company whether currently outstanding or issued in the future either (x) contain the same provisions as set forth in this Section 16, and all officers, directors and holders of 1% or more of the issued and outstanding Common Stock and their affiliates (the “Lock-Up Persons”) enter into identical provisions as to this Section 16 with respect to all shares of Common Stock owned beneficially and/or of record by all such persons and (y) the Lock-Up Persons enter into identical restrictions with respect to all shares of Common Stock owned beneficially and/or of record by all such Lock-Up Persons. In the event any and all of the Lock-Up Persons enter into such agreements or have identical provisions in their warrants and/or options, but any of such Lock-Up Persons are released in whole or in part from such agreement and/or provisions, then the provisions of this Section 16 shall be automatically terminated and null and void. Notwithstanding anything to the contrary set forth in this Section 16, nothing in this Section 16 shall be deemed to be or have the effect of amending, terminating, modifying or otherwise changing any term, condition or restriction under any separate Lock-Up Agreement entered into by Holder with respect to the IPO (“Separate Lock-Up”). If there are any conflicts between the provisions in this Section 16 and any Separate Lock-Up provisions, the Separate Lock-Up provisions shall control.

17.                               Holder Representations & Warranties.  Holder hereby represents and warrants to the Company as follows:

a.              Holder understands that no public market currently exists for the Warrant or Warrant Shares (collectively, the “Securities”) and that there are no assurances that any such market will be created.

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b.              Holder specifically acknowledges and understands that certificates representing the Securities will bear substantially all of the legends set forth in this Warrant, in addition to any other legends required by this Warrant or otherwise.

c.               Holder has full power and authority to deliver these representations and warranties in relation to the Holder’s purchase of the Securities.

d.              Holder is an “accredited” investor as that term is defined under Regulation D promulgated under the Securities Act of 1933, as amended, and neither Holder nor any person or entity with whom Holder shares beneficial ownership of the Company’s securities, is subject to any of the “Bad Actor” disqualifications described in Rule 506(d)(1)(i) to (viii) under the Securities Act.

e.               Holder acknowledges that the Company and is entitled to rely on the truth and accuracy of the foregoing representations and warranties and that the foregoing representations and warranties will survive Holder’s admission as a Holder of the Company.

f.                Holder represents and warrants that the above acknowledgements, representations and agreements are true and accurate as of the date hereof.  Holder also agrees to inform the Company should any of the information contained in these representations and warranties cease to be true and/or accurate.  Holder acknowledges that in the event it does not inform the Company of any change to the information contained in these representations and warranties, the Company and its respective professional advisers will be entitled to continue to rely on the truth and accuracy of the foregoing representations and warranties until and including the date the Holder purchases the Securities.

18.                                          Miscellaneous.

(a)                                                      No Rights as a Stockholder. The Holder, solely in such Person’s capacity as a holder of this Warrant, shall not be entitled to vote or receive dividends or be deemed the holder of share capital of the Company for any purpose, nor shall anything contained in this Warrant be construed to confer upon the Holder, solely in such Person’s capacity as the Holder of this Warrant, any of the rights of a stockholder of the Company or any right to vote, give or withhold consent to any corporate action (whether any reorganization, issue of stock, reclassification of stock, consolidation, merger, amalgamation, conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance to the Holder of the Warrant Shares which such Person is then entitled to receive upon the due exercise of this Warrant. In addition, nothing contained in this Warrant shall be construed as imposing any liabilities on the Holder to purchase any securities (upon exercise of this Warrant or otherwise) or as a stockholder of the Company, whether such liabilities are asserted by the Company or by creditors of the Company. Notwithstanding this Section 18(a), the Company shall provide the Holder with copies of the same notices and other information given to the stockholders of the Company, contemporaneously with the giving thereof to the stockholders.

(b)                                                  Successors and Assigns.  Subject to compliance with applicable securities laws and the terms of this Warrant, this Warrant may be assigned by the Holder. This Warrant may not be assigned by the Company except to a successor in interest. This Warrant shall be binding on and inure to the benefit of the parties hereto and their respective successors and assigns. Subject to the preceding sentence, nothing in this Warrant shall be construed to give to any Person other than the Company and the Holder any legal or equitable right, remedy or cause of action under this Warrant. Any attempted assignment in violation of this Section 18(b) shall be null and void.

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(c)                                                       Amendment and Waiver.  The Warrants, including this Warrant, may be amended, modified or supplemented, and waiver or consents to departures from the provisions of the Warrants may be given, if the Company and the holders of outstanding Warrants representing at least a majority of the shares of Common Stock purchasable under the outstanding Warrants consent to such amendment, modification, supplement, waiver or consent. Such consent may be effected by any available legal means, including without limitation at a special or regular meeting, by written consent or otherwise.

(d)                                                      Non-circumvention.  The Company hereby covenants and agrees that the Company will not, by amendment of its corporate charter, bylaws or through any reorganization, transfer of assets, consolidation, merger, scheme of arrangement, dissolution, issue or sale of securities or any other voluntary action, seek to avoid the observance or performance of any of the terms of this Warrant and will at all times in good faith carry out all the provisions of this Warrant. Without limiting the generality of the foregoing, the Company shall not increase the par value of any shares of Common Stock receivable upon exercise of this Warrant above the Exercise Price then in effect.

(e)                                                       Governing Law; Jurisdiction.   This Warrant shall be governed by and construed solely and exclusively in accordance with the internal laws of the State of New York without regard to the conflicts of laws principles thereof. The parties hereto hereby expressly and irrevocably agree that any suit or proceeding arising directly and/or indirectly pursuant to or under this Warrant shall be brought solely in a federal or state court located in the City, County and State of New York. By its execution hereof, the parties hereby covenant and irrevocably submit to the in personam jurisdiction of the federal and state courts located in the City, County and State of New York and agree that any process in any such action may be served upon any of them personally, or by certified mail or registered mail upon them or their agent, return receipt requested, with the same full force and effect as if personally served upon them in New York City. The parties hereto expressly and irrevocably waive any claim that any such jurisdiction is not a convenient forum for any such suit or proceeding and any defense or lack of in personam jurisdiction with respect thereto. In the event of any such action or proceeding, the party prevailing therein shall be entitled to payment from the other party hereto of all of its reasonable counsel fees and disbursements.

(f)                                                    Headings.  The headings herein are for convenience only, do not constitute a part of this Warrant and shall not be deemed to limit or affect any of the provisions hereof.

(g)                                                      Severability.  In case any one or more of the provisions of this Warrant shall be invalid or unenforceable in any respect, the validity and enforceability of the remaining terms and provisions of this Warrant shall not in any way be affected or impaired thereby, and the parties will attempt in good faith to agree upon a valid and enforceable provision which shall be a commercially reasonable substitute therefor, and upon so agreeing, shall incorporate such substitute provision in this Warrant.

[Signature page follows]

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IN WITNESS WHEREOF, the Company has caused this Warrant to be duly executed by its authorized officer as of the date first indicated above.

SIGNATURE PAGE TO WARRANT TO PURCHASE COMMON STOCK

EXHIBIT A

Form of Assignment [SUBJECT TO EXHIBIT C]

(To assign the foregoing Warrant, execute this form and supply required information. Do not use this form to purchase shares.)

FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced thereby are hereby assigned to

EXHIBIT B

Form of Exercise Notice

(To be executed by the Holder to purchase shares of Common Stock

under the foregoing Warrant)

Ladies and Gentlemen:

(1)         The undersigned is the Holder of Warrant No.                      (the “Warrant”) issued Jaguar Animal Health, Inc., a Delaware corporation (the “Company”). Capitalized terms used herein and not otherwise defined herein have the respective meanings set forth in the Warrant.

(2)         The undersigned hereby exercises its right to purchase                      Warrant Shares pursuant to the Warrant.

(3)         The Holder shall pay the sum of $               in immediately available funds to the Company in accordance with the terms of the Warrant.

(5)         Pursuant to this Exercise Notice, the Company shall deliver to the Holder                            Warrant Shares in accordance with the terms of the Warrant and, after delivery of such Warrant Shares,                            Warrant Shares remain subject to the Warrant.

The undersigned hereby represents and warrants that the aforesaid shares are being acquired for the account of the undersigned for investment and not with a view to, or for resale, in connection with the distribution thereof, and that the undersigned has no present intention of distributing or reselling such shares.  In support thereof, the undersigned agrees to execute an Investment Representation Statement in a form substantially similar to the form attached to the Warrant as Exhibit C.

The undersigned hereby agrees that it shall not sell, offer, pledge, contract to sell, grant any option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise transfer or encumber, directly or indirectly, any securities of the Company as set forth in the Warrant.

EXHIBIT C

INVESTMENT REPRESENTATION STATEMENT

In connection with the purchase of the above referenced shares (the “Securities”), the undersigned represents to the Company the following:

The undersigned is aware of the Company’s business affairs and financial condition, and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Securities.  The undersigned is purchasing these Securities for its own account for investment purposes only and not with a view to, or for the resale in connection with, any “distribution” thereof for purposes of the Securities Act of 1933, as amended (the “Securities Act”).

The undersigned understands that the offer and sale of the Securities have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of the undersigned’s investment intent as expressed herein.  In this connection, the undersigned understands that, in the view of the Securities and Exchange Commission (the “SEC”), the statutory basis for such exemption may be unavailable if this representation was predicated solely upon a present intention to hold these Securities for the minimum capital gains period specified under tax statutes, for a deferred sale, for or until an increase or decrease in the market price of the Securities, or for a period of one year or any other fixed period in the future.

The undersigned further understands that the Securities must be held indefinitely unless the offer and sale of the Securities are subsequently registered under the Securities Act or unless an exemption from registration is otherwise available.  Moreover, the undersigned understands that the Company is under no obligation to register the offer and sale of the Securities.  In addition, the undersigned understands that the certificate evidencing the Securities will be imprinted with a legend which prohibits the transfer of the Securities unless the offer and sale of the Securities are registered or such registration is not required in the opinion of counsel for the Company (or counsel to the Holder).

The undersigned is familiar with the provisions of Rule 144, promulgated pursuant to the Securities Act, which, in substance, permits limited public resale of “restricted securities” acquired, directly or indirectly, from the issuer thereof, in a non-public offering subject to the satisfaction of certain conditions.

The Securities may be resold pursuant to Rule 144 provided the Holder complies with the relevant provisions of Rule 144 applicable to the Holder.

The undersigned further understands that in the event that all of the applicable requirements of Rule 144 are not satisfied, registration under the Securities Act, compliance with

Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rule 144 is not exclusive, the Staff of the SEC has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rule 144 will have a substantial burden of proof in establishing that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk.

The undersigned hereby ratifies and confirms all of the original Holder’s representations and warranties set forth in Section 17 of the Warrant, including but not limited to that the undersigned is an “Accredited Investor” as set forth in the Warrant and is not a “Bad Actor”  as set forth in the Warrant and if the undersigned is not a United States person as defined by Section 7701(a)(30) of the Internal Revenue Code of 1986, as amended (the “Code”)), Holder hereby represents that Holder has satisfied itself as to the full observance of the laws of its jurisdiction in connection with any invitation to subscribe for the Securities or any use of the Warrant, including (i) the legal requirements within its jurisdiction for the purchase of the Securities, (ii) any foreign exchange restrictions applicable to such purchase, (iii) any government or other consents that may need to be obtained in connection with such purchase, and (iv) the income tax and other tax consequences, if any, that may be relevant to the purchase, holding, redemption, sale or transfer of the Securities.  Holder’s purchase and payment for and continued beneficial ownership of the Warrant Stock will not violate any applicable securities or other laws of Holder’s jurisdiction. Holder acknowledges that no representations or warranties, oral or written, have been made by the Company or any agent thereof in connection with Holder’s exercise of this Warrant.