I know this thread is very old, but did you ever end up finding out exactly what was wrong with your dog and/or did you go ahead with surgery? I have the exact same thing happening with my dog - he runs around like a maniac, never acts like he is in pain, but his hopping has gotten progressively worse. The vet is not able to pop his knee cap out and his xrays look pretty normal. I don't want to do surgery if I can't pinpoint that this is for sure the problem, but clearly something is bothering him |