Is he broken out anywhere else? Could be a food allergy or even a thyroid problem (cause skin conditions). I would let the vet know that their meds aren't working. You could also try putting a little neosporin on them just to keep them moist.
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Thank you alot.

Hello, I am new here. I am certainly not an expert but my dad was a vet before he retired his 30yr practice.

An animal will not starve themselves to death. Pick a premium dog food, maybe moisten it at first to sort of make a gravy and le...