First of all, did you read the first few pages of this thread? Did you check out the links? The idea that protein causes problems was bad science and ignorance, so don’t worry about that.
Here is Hound Dog Mom’s latest list of foods that have the appropriate amount of calcium for large breed dogs.
https://docs.google.com/viewer?srcid=0BwApI_dhlbnFTXhUdi1KazFzSUk&pid=explorer&efh=false&a=v
You have to sign up to view it, but it’s very worthwhile. Take the list with you to the pet boutiques around where you live and see what is available. DO NOT marry any one food, rotate foods. Do a search on the review side on diet rotation to learn more.
Keep your puppy thin, not just not fat, but thin. Less weight is less stress on joints.
Find a joint supplement with hyaluronic acid in it. That’s what the body needs to make repairs to joints. And consider feeding him a raw turkey neck once or twice a week, they naturally have good stuff for joints in them, since them have a lot of cartilage in them.
If you have bare floors, consider using throw or area rugs at least until he is grown. They think slip and falls can be a big factor in joint damage for puppies. And finally, no stairs for as long as possible. When he has to do stairs, make sure he does them at a walk.
