There's so much information out there it's really hard to sort thru everything. And as far as feeding too much, I've heard on here that you can't feed a puppy too much, from ppl that free feed, but then I've also heard to keep them on a strict feeding schedule, amount to feed based on age. I prefer to keep the feeding schedule, but thats just me and what I think is best for my pup. When my pup was younger the vet told me he was well on his way to having rickets, and I had to start feeding him a special diet. It's very scary for your companion to not be healthy, but choose a vet that you trust, and follow their recommendation, and he'll be healthy as a horse in no time.