I would think detoxing him would be a good first start. Hoping Momto2GSDs sees this. She's pretty good with supplements and such.
Here is a good thread about supplements in general. For now I would start with organic coconut oil, raw apple cider vinegar, vitamin e, and krill oil. Someone correct me if I'm wrong.
My boy had itchy skin a few weeks after we started him on raw. I think it was his body detoxing. This may be the case with your boy too. The above supplements is what got my pup over the hump.
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