Dozer is only 8 weeks old. They dont have
allergies at that age. Ok 99.999% none. The RC basically screwed up his system. Start with the Acana single Pacific pilchard. One bag at the time. If you jump to different proteins you will not know IF he’s allergic to an ingredient in the bag. Lamb is a bit harder to digest. Do the fish, then the duck, then chicken, then the lamb. As a pup, definitely give chicken only after once one bag is finished. You will be building up his immune system. When pups are introduced to chicken as a young age, extremely rare they develop
allergies. I say this often, rotating proteins at a young age like pups is the best thing you can do for any pet. All my dogs had chicken, none ever had issues. Also use raw organs as a topper on his kibbles. 1/2 per day. Loaded of probiotics. BUT wait after a bag or couple bags since you got him off RC.
Again, I stress this often, Rotation as a pup is the KEY to eliminate most if not all
allergies. Jake, Nyala (Duke) all eat/ate Turkey, Beef, Horse, Bison, Chicken, Pork, Duck, any Wild game, any fish etc etc. Because they were introduced every protein on the market as pups.