My boxer Boone turns 2 in May. We got him when he was 9 months. He’s good with other dogs but has an issue when my son’s friends come over. He barks and chases the visitors (male or female) into the bathroom. He’s escalated from nipping at their heals to trying to nip hands. It tends to happen when I’m home and not when my son is home alone with friends over, so Boone is may think he’s “protecting” me. The older boxer I had before was dog aggressive but not aggressive towards people. Right now he’s not getting enough exercise, because of winter, but I’m at a loss as to what to do. I’m single so I want the protection in the event there is an intruder but even when the visitors give him treats he doesn’t back down. Thanks for any advice you can provide!