It’s funny you should mention that because Ivory Coat came out with a new formula for just that reason, despite confirming that chicken fat in this case should not cause a reaction it did for some people, so they created a new fish formula less the chicken fat.
So I believe that chicken fat on the rare occasion can indeed cause allergic reactions to dogs with a chicken allergy, but from what I’ve read over several articles it’s like getting unlucky and getting the short end of the rope because it seems to pretty rare.
