a good food for pits (imo) is a few different brands of food you can get from farming supply stores. they are super high in protein (most of them over 50%) and its mad cheap (like 15$ for a 50lb bag). between me and my friends and family we have all used different varieties of this kind of food and out dogs are in great shape and very solid. they all have nice coats as well. but this food is more for strength/mass.