November 17, 2008

Dear Doctor,

As a key customer and valued stakeholder in the IDEXX Laboratories' equine business, we want to inform you that IDEXX Laboratories sold its SURPASS® (1% diclofenac sodium) Topical Anti-Inflammatory Cream franchise to Boehringer Ingelheim Vetmedica, Inc. (“BIVI”), a leading animal health pharmaceutical company, on November 14, 2008.

You can continue to order these products as you do today, since IDEXX and Boehringer Ingelheim share the same distributors. Boehringer Ingelheim is committed to providing you with a continued high level of customer service and product innovation for SURPASS. For BIVI product assistance, call 1-800-325-9167.

The decision to sell these products allows IDEXX to concentrate on our core businesses of equine reference laboratory testing, in-hospital diagnostics, digital imaging, and practice management software. We have confidence that the additional focus on these core businesses will generate a broader array of new equine products that will provide practitioners with opportunities to improve equine health care.

If you have further questions, please contact me at 1-336-834-6505.

Sincerely,

Scott Moffitt
Senior Manager, Equine Sales and Marketing
IDEXX Laboratories, Inc.