Sounds like you’ve already got some ideas for foods to try – I don’t know that many brands personally, so I usually say it’s safe to go with 4-5 star brands.
As for the skin. I wouldn’t expect a bath to help much, as soaps tend to strip the coat even more, unless they’re medicated and designed for dry skin (when my dog is super dry, I use an oil-based organic shampoo. Sometimes it’s almost too much though, and my dog doesn’t feel clean at all).
Some things to look into: possibly tests for food allergies? As almost all skin problems have something to do with food, sadly. It could be chicken, grains, tomatoes, fish, the list goes on. I’d try getting him on coconut oil – organic extra virgin cold pressed, about 1tbsp per 30lbs. That stuff has been known as a miracle worker around these parts! Salmon oil is very good, too. Keep that up, 🙂
Fiber additions – most people add a big spoonful of pumpkin (canned is fine) to their dogs food. If there’s no improvement in his morning routine, then possibly try some probiotic supplements as well.
