Pepper ( almost 8 mths) gets super excited whenever there is somebody at the door. She tends to greet people by wagging her tail vigorously and jumping on them. It gets really hard to control her at that time....nothing seems to work. And its not always possible to tell the guests to ignore her or turn their back on her. I need ideas on what to do. Should I consider a prong collar inside the house (She's never had one before!)? Help!