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Originally Posted by Caesars Mom  We feed California Natural Lamb and Rice Small Bites. We have used this product for many many years and there is no corn or soy in it. That is the first thing I thought of, but he has never had a problem with it before. |
Actually, that's how dogs (and people, too) become allergic to foods, by constant exposure. That's why allergic dogs are usually switched to "unusual" protein and carb sources like duck and potato, fish and sweet potato, etc.
Caesar has probably built up antibodies against lamb and rice now. I'd try one of the foods I suggested and rotate them regularly to prevent the same thing from happening. I'd also add fish or salmon oil to help build up his immune system. That's what my vet had me do with Lady and it's helped a lot.