As some of you know my Pekingese has some aggressive behavior, I have figured out what causes it; if I am at the dog park with him (or out for a walk, etc) and there are other dogs around, and one happens to come near me, sniffs me, or licks me, he runs up to it growling, and I can tell when he is about to snap so I grab his mussel and hold it till he stops growling. It seems to be working because he is letting certain dogs around me, but others he won't let anywhere close to me. I'm just wondering if you have any other discipline I can try, or exercises I can do with him at home?