POWER OF ATTORNEY
					JAY LICHTER

	With respect to holdings of and transactions in securities issued by Aratana Therapeutics, Inc.,
the undersigned hereby constitutes and appoints the individuals named on Schedule A attached hereto and as
may be amended from time to time, or any of them signing singly, with full power of substitution and
resubstitution, to act as the undersigned's true and lawful attorney-in-fact to:


1.	prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to the United States
	Securities and Exchange Commission (the "SEC") a Form ID, including amendments thereto, and any
	other documents necessary or appropriate to obtain and/or regenerate codes and passwords enabling the
	undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the
	Securities Exchange Act of 1934, as amended, or any rule or regulation of the SEC;


2.	execute for and on behalf of the undersigned, Forms 3, 4, and 5 in accordance with Section 16 of
	the Securities Exchange Act of 1934, as amended, and the rules thereunder;


3.	do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to
	complete and execute any such Form 3, 4, or 5, complete and execute any amendment or amendments thereto,
	and timely file such form with the SEC and any stock exchange or similar authority; and


4.	take any other action of any type whatsoever in connection with the foregoing which, in the opinion of
	such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned,
	it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant
	to this Power of Attorney shall be in such form and shall contain such terms and conditions as such
	attorney-in-fact may approve in such attorney-in-facts discretion.


	The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and
every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and
powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally
present, with full power of substitution and resubstitution or revocation, hereby ratifying and confirming all that
such attorney-in-fact, or such attorneys-in-fact substitute or substitutes, shall lawfully do or cause to be done
by virtue of this Power of Attorney and the rights and powers herein granted.


	The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the
request of the undersigned, are not assuming, nor is any Company assuming, any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended.


	This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to
file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by
Aratana Therapeutics, Inc., unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.


	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 4th day of
 June, 2013.


/s/ Jay Lichter
----------------
Jay Lichter





					Schedule A


	Individuals Appointed as Attorney-in-Fact with Full Power of Substitution and Resubstitution


	1.  Steven St. Peter, M.D., President and Chief Executive Officer
	2.  Craig Tooman, Chief Financial Officer
        3.  John C. Ayres, General Counsel