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Sonya, has he had a full skin mark up done? This needs a GA as they take tissue biopsies, scrapes of tissue (several layers to make it bleed), some hair, nose swabs, and bloods.
I had one done for my dog last year and the test also included food and environmental allergies.
If it is food allergy it will say on the results - giving scores like 0 = no tendency, to 5 = high tendency.. of say, lamb, or rice etc. I think it was called a Sensitest.
Don't know if this helps..
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