When I feed my dog bones, chicken or beef, he gets dandruff. Should I pay hundreds of dollars to see what’s going on?

He is currently on a salmon diet. Grain free. I recently bought him some probiotic snacks and his skin has been clearing up which is surprising to me, but I don’t know if a probiotic supplement is enough to keep his skin at bay. Any thoughts will be appreciated. Thank you.

He’s a labradoodle. 4 year old
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