Our smallest dog "Flap," is a Chihuahuah/Pikenese mix. When he was small, I always used to get irritated with him because he would lick and bite all the time. When he finally realized I didn't like him to do that, he would bite his licence tag on his collar and hold it in his mouth untill I stopped petting him He still does that to this very day and he's a little over 7yr. old!!!!! He's a very smart little dog, and tries to do whatever he can to please me