Grain free diets will not lessen the chances of allergies, same as grain inclusive foods won’t cause them either. My AmStaff cross can not eat majority of grain free diets on the market because he is sensitive to peas. I fed him grain free diets for the first year and a half of his life, did a rotational diet and he still has allergies due to his genetics.
The genetics of the dog is likely going to play a larger role in allergic response than what kind of food it’s fed as a puppy. Grain free or grain inclusive is moot imo. The main focus should be optimal growth.
