With his history it is very possible that he has a torn ligament. It may not be, but I would be suspect for sure since he has had problems with LP for a while.
It is best to take him in for an exam. Just because he is not wimpering does not mean he is not in pain. The fact that he is not using it says he is. Usually a vet will prescribe an anti inflammatory for a week or two to see if a pup gets relief.
Yes, the surgery is expensive and especially so if you use a board certified surgeon, but well worth it in the end if he needs it. They do recover from the surgery and do well afterwards in most cases. He is not too old for a surgical repair. |