We have also used the Orijen 6 fish..... he likes the red better.
We simply have to stay clear of chicken , grain and grasses. We went through the blood test garbage... grrr $$$. Falco had the ear infections and hotspots. At present they are mostly controllable... we also bathe him once a week with a medicated shampoo.
I hate going through all of this stuff, but he’s much more comfortable and I consider it my responsibility to do the best for my good friend.
Have you tried Dinovite for the skin condition? Go on their website.