When looking at feeding grain free food just be sure and check you have no pea or potatoe protein in your food, and a lower fat.
Our favorite and foods we see the most large breed puppies on are the following at my work:
Holistic Select Large Giant breed with a 23%P and 12%F
Firstmate POF 23%P and 10%F
Canidae Large breed 23%P and 13%F
My mastiffs have done amazing on firstmate and it has actually helped tremendously bring her levels down (she has liver disease and the vet had her on royal canin and she did horrible on it)
Each cup takes roughly 4 hrs to break down so if your dogs eating 6 cups a day or something their is not enough hours for them to break it down.
Bigger breakfast and smaller dinner, same with humans you don’t want to eat a huge meal before bed time. We don’t burn and store it, feel sluggish etc.
