Join Date: May 2011
Location: Northern California
Likely he will be large, since both parents were large, and he is big-boned. I'd guess 95+ lb. at maturity. Just don't let him get fat!
To keep him healthy, keep him on the lean side as he grows. He is big-boned and doesn't appear overweight (though it's hard to tell from the photos). Of course he will be starving all the time, but don't feed him as much as he will eat. Too much food will spur faster growth, and what you want is slow, steady growth, so that his body doesn't get too big for his joints to handle.
Avoid hard exercise while he is young. Walks and hikes are great, ball play is great, swimming is excellent. You don't want him running a lot on hard surfaces, jumping, or going up and down stairs.
When he gets a bit older, say around 6-9 months, you can get x-rays of his hips and elbows, just so you know what they look like, and if you can expect problems later on. Size alone does not cause hip dysplasia, you just have to remember that the more weight he is bearing, the more stress there is on the joints--another reason to keep his growth slow and controlled, to give his joints time to develop properly, so that they can effectively bear his adult weight.
Cute pup, I like his face in the first pic.