My pug, Stoney, barks and go crazy whenever someone leave the house. I thought he was the only one who did that strange behavior. I guess it is a common behavior. I have another pug, and she does not bark most of the time. Stoney also barks when we go for a walk and he sees another dog or stranger unless he is truly familiar with them. He also barks at the TV when any animal comes on, dog, cat, even an elephant.