I think natural food is the best, but you also need to give supplements with vitamins, this is important for any dog. I had problems with allergies in my dog and after the advice of a veterinarian, I made this conclusion. As I said it is important to have a balanced diet for dogs you need a special diet with vitamins https://petsmatters.net/top-5-best-dog-food-for-pitbulls/ which was recommended by the veterinarian and porridge with bread, it is very good for the stomach of dogs. I have a very energetic and cheerful dog and most importantly healthy:)