Pitlove,
The protein theory HAS essentially been debunked. The best you can do for prevention of Pano is to keep your pup lean, and keep his growth slow and steady, with a low calcium/phosphorus diet. There has even been some recent argument that for large breed puppies, it may even be better to feed them an adult diet earlier, reducing the calories they’re getting as well as having a lower calcium/phosphorus content, but I’m awaiting word from a conference a friend is attending before stating that as fact.
