Back leg issue. Maybe pinched nerve?
My boy Junior is 3 years old and about a month or 2 ago I was throwing him a ball and he jumped to catch it and when he landed he started yelping really loud for 30 seconds to a minute holding his rear leg up, I was trying to calm him down rubbing his back leg and when he stopped yelping he got up real fast and starting running back and forth wanting me to throw the ball again, no limp at all. So in the past 2 months or so this has happened about 3 or 4 times, loud constant yelp, calm him down, then BAM ready to run again. Very strange any ideas what it could be?