Kai has never snapped at me for doing something he doesn't appreciate but he does do that to my siblings. When they touch him in the wrong place, he takes a nip and growls a bit. If I'm there, I'll correct him by saying NO! while I hold his muzzle firmly followed by about 5 seconds of eye contact. Of all those, he hates the eye contact the most...he can tell when it's a "you did a no-no" kind of eye contact.