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I thought food allergies would always show up in skin issues. This is NOT true. Food allergies show up in many different ways. In a diabetic it means glucose out of control due to an inflamatory response every time they eat. The only time I responded to a food allergy is when Andys skin broke out, or turned red or his ears turned red. I always looked for an outward physical manifestation.
Turkey and Chicken did none of those things to him so I felt he was not allergic to them. But internally it was causing an allergic response that played havoc with his glucose control. Not to mention making him sick and lethargic.
If your dog is hard to regulate and you feel you have ruled out infection, I would recommend you get the RAST test done. You can have the food panel only run for approximately $200. It is just a blood draw that is sent off to a lab so you can certainly shop around for best price. The individual Vet does not do the test so it does not matter where you go.
And yes there are a lot of opinions about the RAST test versus skin prick testing pros and cons. The skin testing is probably better if you are looking to test for airborne allergies and opt for allergy shots. But if you are looking for food allergies the RAST test is a very good one. Cheap by comparrison and easy to do. All I can say is that it changed Andy's life and mine too!
Apparently it wasn't terribly expensive and has really helped her dog.