have you ever considered RAW?
Keegan has simply THRIVED on Raw for about 13 months.
When I was researching it said that a lot of dogs that have allergy to a certain protein (example: chicken) in a dog food are not allergic to the pure protein source when it is given raw. Now I know that RAW isn't for everyone and I have only one dog. I also know that when Anna fed her girls RAW chicken they got really itchy so they don't get it. I've found a small grocery here in town that sells Amish chicken and it doesn't have all the anti-biotics in it and the chickens are grain fed. It doesn't have the film on them like when I buy them at Walmart. Keegan doesn't seem to be affected either way, Thank GOD b/c she gets Chicken A LOT! (cheaper)
just a thought...
if not - There's a zillion kinds of food out there. GOOD LUCK!!