Yes, dogs allergic to chicken will be allergic to eggs, duck, turkey and any type fowl. Mine are. I worked for a dermatology vet, and chicken was the number one allergy problem. Mine are also allergic to pork, but not beef or fish. I feed venison and sweet potato, mainly Natural Balance, it's a limited ingredient diet. My dogs had a lot of gas with the lamb and rice, so we avoid that. I also make my own treats, because the market is flooded with egg and chicken recipes.