My 2 1/2 years old pappilion likes to play fetch at breakneck speeds. Recently I've noticed that a few hours after he has played and has gone to bed, when he gets up he favors his left leg and limps for a while. Then he goes back to playing hard and seems to be OK after he "loosens" up. Then the cycle repeats its self. This had been going on for about two weeks. I've tried to keep him quiet by not playing, but he starts to play with himself and it still happens.
Optional Information:
Age: 2; Male; Breed: Pappilion
Already Tried:
to keep dog quiet