Dogs who are allergic to chicken can be allergic to all feathered animals. You have to test with trial and error. The only food I would stay away from now is rabbit, because if you decide to try a novel protein the only one available in a prescription is rabbit and potato. Mine at one point got a reaction to white rice and pumpkin. His skin cleared up a lot when I switched to filtered water. They can be allergic to anything, just like humans can.