I agree with zcRiley about Glacier Peaks Holistics sensitivity tests at
Pet Intolerance Test Wholesale (6 pack)
They test for over 200 foods and environmental substances to which your pet could be sensitive. The test is $89 and easy to do requiring a small hair clipping and a mouth swab and all the collection materials are sent to you. For an extra $10 you can get the results the day after receiving your kit. Other on-line tests I’ve seen can be as much as $300 and test for fewer possible allergens. The test has helped me help my 5 month old lab/Rottweiler rescue/adoption fur-ever family member.
