My boy is a year old and 105lbs. He started out with Purina pro plan since 10 weeks old and that lasted until about 6 months. He started to throw up his food and his stool became diarrhea all the time. I then switched to taste of the wild high prairie puppy food and he had been good on that ever since. I would like to switch him to Acana food but not sure which one. I’m not sure if there’s a chicken allergy and grain allergy. Taste of the wild is grain free and is bison and venison based which he has been good with.