Labs are known to be allergic to anything with feathers and often beef. I switched over to fish and my Lab improved 100%. I mix 1 cup of Fromm dry kibble with 1 cup of a salmon, rice, carrot, green bean mix. The original breed ate a lot of fish. They were used by fisherman.
My son’s FIL suggested whitefish and salmon. After we’re done with the salmon oil, I bought some canned dog with both. Called Authority brand.