None of the foods you listed are very good foods. With the exception of Medi-Cal and Techni-Cal (which I have not researched at all so I could be wrong) the foods you listed are full of fillers that are more likely your allergens. While it is uncommon for a dog to be allergic to a meat product, it is unlikely to be allergic to all meat products. Beef and chicken have little in common. Unless it is in the processing. Since Dog Chow and Iam use meat by products, that could well be part of the problem.