My dog is not truly allergic to anything, but he does have food hypersensitivities. He reacts to all bird ingredients, tomato, flax, all grains, and possible alfalfa(we are still testing for that). Dogs can react to any food that has proteins in it, and there is some new research that is showing that it is possible to have reactions to fats too. The way to determine your dogs sensitivities is to do an elimination diet. If you can’t do that then you need to try foods that are Limited Ingredient Diets that do not have ingredients that your previous foods had, which means gathering and saving ingredient lists. You may want to look into Canine Caviar and Nature’s Variety Instinct LID.
