What are symptoms that he is displaying? If it is digestive, such as diarrhea, then possibility of too much fat in diet. If skin issue then first look into irritants such as flea bites or even something as overlooked as bedding washed with scented detergent?
I never found any validation that allergy tests work . Hope link works below.
Research Update: Testing for Food Allergies
So hard to actually do elimination diet. There are so many ingredients in dog food that might cause sensitivity other then just the protein. If you take a look at the ingredient list on the average kibble you’ll see what I mean.
Possibly try a one protein food without added supplements. Freeze dried such as Vital Essentials just the protein/flavor with no extras’ I believe. Very expensive to feed however. I believe it also comes in frozen which is more cost saving. I use Primal, small batch, Bixbi Rawbbles, and at times Stella Chewys.
Just go VERY, VERY, VERY slowly with switch. Also if you look at reviews on DA you’ll see the 5* rated foods in these brands. I ONLY use the proteins DA rates in the brand with 5*’s. The ones that rate lower are too much fat to protein. This can cause loose stools and stomach upset all the way to pancreatitis in some dogs.
I use a SMALL amount of kibble as base to stretch the freeze dried. This being Stella Chewys raw coated grain free.. If you look at their f/b page there are many who had trouble with diet and most do well on this kibble.
Hope this helps. Again any change in diet much go so slowly.
