Another food choice you can consider is Dick Van Patten's Duck and Potato food. It is an allergy formulated food with only one carb and one protein source, both of which most dogs have not had before. This is what I used on my pup when trying to figure out if he had food allergies. You also have to remember not to give treats and such. I know that there are duck and potato treats, but I never used them. You can find this stuff at Petco. Good luck and keep us posted!     
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