POWER OF ATTORNEY FOR SECTION 16 REPORTING
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Robert B. Grieve,Jason A. Napolitano, Michael
A. Bent and Mark D. Cicotello, and each of them, his or her true and lawful
attorneys-in-fact, each with capacity as an officer and/or director of Heska
 Corporation any Forms 3, 4, and 5 and any amendment thereto, in accordance
with Section l6(a) of the Securities Exchange Act of 1934, as amended, and
the rules thereunder, and to complete and file the same with the Securities
 and Exchange Commission and any stock exchange or similar authority, hereby
ratifying and confirming all that each of said attorneys-in-fact or their
substitute or substitutes may do or cause to be done by virtue hereof. 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 Heska Corporation assuming, any of the undersigned's responsibilities to
comply with Section 16 of the Securities Act of 1934. 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 Heska Corporation, unless either
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 this 3rd day of March, 2007
Signature: Print Name: Nancy Wisnewski