Heska Corporation (Nasdaq: HSKA) today announced its Des Moines-based subsidiary ("Heska Des Moines") has amended its bovine vaccine distribution agreement with Agri Laboratories, Ltd. ("AgriLabs"). Heska Corporation ("Heska" or the "Company") reports revenue generated under this agreement in Heska's Other Vaccines, Pharmaceuticals and Products segment. Under the terms of the amended agreement, Heska Des Moines agreed to fund a portion of development spending under the remaining research and development agreement with AgriLabs in return for certain distribution rights.

Under the amendment, AgriLabs will continue to market the underlying bovine vaccines in the United States, Africa and Mexico through December 15, 2013. Subject to minimum purchase requirements, AgriLabs' rights in these regions will be exclusive through December 15, 2009. Heska Des Moines is free to sell these bovine vaccines to any party of its choosing in other regions of the world. AgriLabs will also maintain non-exclusive rights to these bovine vaccines in Canada through December 15, 2008.

"The vaccines underlying this agreement are well known in the United States and Africa cattle markets where they are sold under AgriLabs' label and tradenames Titanium(R) and MasterGuard(R). We were pleased when AgriLabs began to sell these vaccines in new markets, first in Africa and most recently in Mexico," said Robert Grieve, Heska's Chairman and CEO. "We are pleased to continue our positive working relationship with AgriLabs and continue to benefit from their livestock market expertise."

"We are proud of the leadership position we have established for these vaccines. Our research and development agreement with Heska Des Moines is the cornerstone of our commitment to maintain the preeminence of these vaccines in the marketplace," commented Steve Schram, AgriLabs' President and CEO. "We are pleased Heska Des Moines has agreed to fund a portion of this effort. We view this as another installment in a long history of mutually beneficial agreements between our companies."

About Heska

Heska Corporation (Nasdaq: HSKA) sells advanced veterinary diagnostic and other specialty veterinary products. Heska's state-of-the-art offerings to its customers include diagnostic instruments and supplies as well as single use, point-of-care tests, vaccines and pharmaceuticals. The company's core focus is on the canine and feline markets where it strives to provide high value products and unparalleled customer support to veterinarians. For further information on Heska and its products, visit the company's website at .

About AgriLabs

AgriLabs is the largest private label marketer of veterinary vaccines and pharmaceuticals in the United States. AgriLabs is proficient in sales, marketing and technology transfer of current and future compounds or antigens for both food and companion animal markets. The AgriLabs distribution network of distribution owners is the largest in the United States and has the ability to efficiently reach the livestock and consumer marketplace through various veterinary, direct and retail channels. For additional information on AgriLabs and its products or distributors, visit the company website at .

Forward-Looking Statements

This announcement contains forward-looking statements regarding Heska's future financial and operating results. These statements are based on current expectations and are subject to a number of risks and uncertainties. In addition, factors that could affect the business and financial results of Heska generally include the following: risks regarding the commercialization and market acceptance of products the Company may introduce in the future; risks relating to the size and stability of markets for the Company's products, such as foreign markets for cattle vaccines which are generally smaller than the corresponding domestic market and may be subject to greater volatility; uncertainties regarding the outcome of research and development efforts, which may not yield marketable products or any products at all; uncertainties regarding reliance on third parties to whom substantial marketing rights to existing products have been granted, such as reliance on an exclusive distribution agreement with AgriLabs and the affiliated risks of relying on perceptions of AgriLabs' brand and trademarks in the marketplace; competition; and the risks set forth in Heska's filings and future filings with the Securities and Exchange Commission, including those set forth in Heska's Annual Report on Form 10-K for the year ended December 31, 2006 and Quarterly Report on Form 10-Q for the quarter ended September 30, 2007.