Anyone seen this? Took our dog out yesterday to wear him out chasing a frisbee and ball, everything was fine, came home and about an hour later, he was hobbling around not putting any weight on one of his rear legs. Same thing happened a couple of weeks ago. He hobbled around for a couple of days but then was right back at it. Weird that there is no obvious injury and he comes up lame some time after he's been out running around and he's been out running a number of times between the two incidents with no problem.

I'd think a muscle pull or something that tightened up once he was just lounging around. But he's only a little over a year old, and seems to be in a good bit of pain for a muscle pull. Worried that it's his hip or something.