I am going to make sure to talk throughly with the vet about this. When I move her leg myself check for any stiffness or pain with motion there isn't any she doesn't tense on her left any more then her right so I am at a loss as to why she is limping, I talked to the vet and he said since it happened after running around hard outside and it came on so quick that she might have pulled something and is simply not using a hurt ligament. But he said to keep her appt. and if it gets worse or not better in a few days call to bring her in sooner.