Vets don't like to tell their clients unless it's a pretty severe problem, because it offends some of them
I see it in his chest too - which takes time to pack on. But it could be the pics and angle. Do you have more of him?
I was going to mention that when we first started doing rescue we had a Newf x Lab. You could just tell by the bone structure this was going to be a very large dog as an adult.
Some people applied who stated they had a Lab x Newfie now and wanted to adopt this kiddo we had, so we approved them and they came to get the dog.
Well, when they arrived they were talking about their dog and he looked more like a Spaniel mix, a medium sized dog, no more than that. But fat. OMG. They were feeding him for a large breed dog and this poor guy was around 50-60lb. and probably should have been no more than 40lb. I didn't say much because I figured I'd never convince them their dog was fat and not a Newf x., and I'd just offend them.
But I know that as that puppy grew up, he became much larger than their 1st "Newf x"!!