Dog aggressive when people are leaving
My friend adopted a lab/doberman mix from a shelter a year ago. Her dog (Violet) had been at the shelter for almost a year; she was surrended initially after her owners were arrested, and then was adopted, but returned, because she was aggressive towards another dog in the home.
Violet is friendly and well-behaved with me and my dog. And no problems with kids. But, my friend says that Violet seems less friendly towards certain adults who come over (mostly men, but not always). And has, on occasion, lunged at people as they are leaving. My friend is a fan of Cesar Milan, and watches his show regularly, but hasn't seen this issue addressed. Of course, for now she puts her dog in a down/stay as people are leaving, and keeps a close eye on her, but would really like to understand her dog's fear? motivation? Why would her dog stay calm for a long period of time when someone is in the house, but show aggression as they leave?