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What are the symptoms? What has he been eating (brand and protein(s))? Has he been to a vet? What tests have been run (if any). Basically give us his medical and food history and responses to those foods. Answering this question in a vacuum may just make him worse.
Julie D.
You might want to consider a grain free food with fish as it's protein source. Check out Merrick and Taste of the Wild brands.