My puppy gets really excited when he chances upon other dogs on our walks. He is very submissive and rolls on his back which is good, but after that he gets up and gets in the other dogs faces and gets way too excited. I have a really hard time holding him back, he just pulls harder and makes wheazy breathing noises because he can't breathe. Someone recommended putting a choke chain on him to teach him to back off the collar. Is there any other method that I could use other than that? I haven't had the nerve to try it yet.