Yes, BUT showing some teeth and even sometimes growling is a sign of submission...My sisters dog does it. She is the sweetest dog. I can tell by looking at her that she is being submissive and not aggressive...I mean, obviously it could mean aggression too, but once they roled over it's pretty obvious they aren't mean dogs....I could see that the lady would do whatever it took to protect her child...but the guy going LOOKING for the dogs JUST to kill them is dumb