I've been feeding Canidae to my pup since he was 3 months old. Been happy with it sofar. I do feed him cottage cheese, eggs, and meat as well. (not large amounts) He has grown very slowly,
and no pano.
I sincerely doubt he's malnourished. He has more pep than the energizer bunny.
I talked to a top show breeder of BullMastiffs about Canidae. She feeds it because her pups don't grow too fast on it, and I understand too rapid growth is a big problem for BullMastiffs as well as Rotties.