Maybe he is about that age were he lifts his leg. Maybe he is trying to show your pug that he is the dominant one. My trainer taught us clicker training, and in this situation she would click and give a treat every time the dog would look at the pup, smelled him, touch the pug, or any time he does good with him. That way he is train not to do such behavior. Just my opinion.
Sent from Petguide.com Free App