Left hip looks a little off but It has been a long time since I looked at X-rays. I was only a Tech. Left Elbow looks a little tiny bit off but not enough to really worry I think. Our pitbull had VERY VERY VERY bad Eldows late in life but he lived hard. I don't know. I would just be really careful Running the pup and doing crazy activities at this time. Do you have a side shot of how the dog stands.
If you do not trust your Vet you can always go find another vet.