[Andy B]

I am no doctor, but my maltese/pekingese has had back leg tremors after an aggressive run or ball chasing episode, and I believe it is adrenalin. The exact same thing used to happen to me when I was a drag racer. He will be 16 in December and is just now starting to show signs of aging. Btw, his brother also has the tremors, but not near as pronounced.