AMENDMENT NO. 2 TO ARATANA THERAPEUTICS, INC. 2010 EQUITY INCENTIVE PLAN Approved by the Board of Directors: December 22, 2012 Approved by the Stockholders: December 28, 2012

Exhibit 10.9(c)

AMENDMENT NO. 2 TO

ARATANA THERAPEUTICS, INC.

2010 EQUITY INCENTIVE PLAN

Approved by the Board of Directors: December 22, 2012

Approved by the Stockholders: December 28, 2012

THIS AMENDMENT NO. 2 TO 2010 ARATANA THERAPEUTICS, INC. EQUITY INCENTIVE PLAN (this “Amendment”) is made and entered into as of December 28, 2012.

WHEREAS, the Board of Directors (the “Board”) and the requisite Stockholders (the “Stockholders”) of Aratana Therapeutics, Inc., a Delaware corporation (the “Company”), approved and adopted the 2010 Aratana Therapeutics, Inc Equity Incentive Plan (the “Plan”) on December 23, 2010;

WHEREAS, the Board and the Stockholders of the Company approved and adopted an amendment to the Plan on October 28, 2011;

Whereas, the Board adopted an amendment to the Plan on September 5, 2012;

WHEREAS, capitalized terms used and not otherwise defined herein shall have the meanings given to them in the Plan; and

WHEREAS, in accordance with Section 11.2 of the Plan, the Board and the Stockholders desire to amend the Plan as set forth in this Amendment.

NOW, THEREFORE, BE IT RESOLVED, that the Plan is hereby amended as follows:

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IN WITNESS WHEREOF, the Company has caused this Amendment to the Plan to be executed as of the date first above written.

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AMENDMENT NO. 2 TO 2010 EQUITY INCENTIVE PLAN]