Yes I have....They really hurt and bruise for ages. I have a naughty box which they go into if they bite. 4 of mine are bite and mouthing free. we are working on Boris just now, he gave my hubby 38 puncture wounds, he is a hibrid poley and is so timid and scared we dread to think what he has been thru' patience, tolerance and love will sort him out. I disagree strongly with hitting them tapping them on the nose, it will teach them to fear the hand. Time out in the naughty box watching the rest of the gang have fun teaches them faster. Well, it works for us...lol