Hi Jacob-
Basically here’s the thing. Companies like Hill’s and Purina have put in years of research into the topic of proper growth and nutrition for large breeds. Royal Canin to an extent but not as much as the other two. In reality these foods are better to use because of how much research is backing them.
Also in reference to All Life Stages foods; no they are not all appropriate for large breed puppies. A lot of companies will not provide a nutrient analysis on their website so you will have to do some leg work and contact them and ask for their MAX levels of calcium and phosphorus in their All Life Stages or growth diets.
Dr. Tim’s Kinesis and NutriSource Large Breed Puppy are 2 excellent foods that you can purchase through chewy.com. Dr. Tim’s has been feed trialed as well which is important.
Fromm would out rank Royal Canin for a lot of people simply because they like the way the ingredients look. Both will let the dog grow properly. RC is just a bigger company that does feed trials and conducts their own research so from the view point of a veterinary nutritionist, RC beats Fromm.
Blue Buffalo is a tad shady of a company and I personally do not feel comfortable recommending them and I wouldn’t use their products again (I did when my pitbull was little).
