I have a 3 month old bullmastiff puppy. We have tried feeding precise holistic large breed which gave him diarrhea and we believe he is allergic to chicken. We switched to nutro limited ingredient and he is still itching and appears to have a slight ear infection. We did mix some of the first food in so that may still be causing problems. He does a lot biting of himself. Looking for a good limited ingredient healthy puppy food that won’t break the bank. Breeder had him on Fromm large breed puppy. They don’t sell it anywhere close to me. Thanks for any suggestions you can give me.