My Daisy who has environmental allergies plus a whole bunch of other problems is always dry and flaky at this time of the year. For her, it is likely the mold allergens in the air and pollens. She uses a medication called Atopica with good results. So many dogs have allergies like we do that are not always food related. I always thought mine was allergic to chicken too, and she wasnt, it was just pine, pollen, grass, mites, dirt, mold, basically all that mother nature gives us.
If he's itching just mildy, you could ask your vet about the use of Omega 3 pet supplements which are known to dampen the immune response in dogs with allergies and promote a healthier coat. We have ours on 1 capsule a day, and it really does help. We use Nordic Naturals brand.
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