Question about dog nutrition?

My bulldog is current on raw duck diet. He eats the bones meat n livers. After trying tons so many commercial dog food like blue.orijen.royal cannie ......... all giving him bad tear stains n diarrhea skin infection... And I gotta hand fed him to get him eating thoes kibbles. Anyway back to the topic....is there... show more My bulldog is current on raw duck diet. He eats the bones meat n livers. After trying tons so many commercial dog food like blue.orijen.royal cannie ......... all giving him bad tear stains n diarrhea skin infection... And I gotta hand fed him to get him eating thoes kibbles. Anyway back to the topic....is there other supplements he should be taking? Since all he gets was duck. I will ask the vet later. But would like to see some advice first.
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