Hi Nat R –
There’s no reason a Great Dane can’t eat a high protein food and, in fact, they should. It’s also not true that they should not eat puppy food as puppies, they need to eat a puppy food with controlled calcium levels appropriate for large breed growth. There’s a lot of information about this on the large breed puppy thread. Many many years ago it was believed that high levels of protein caused joint issues, it’s been known for quite some time now that this isn’t true however there are still a few vets, breeders and pet owners that believe this myth.
