My dog is a pit-lab mix, but it's telling what you refer to her as. And I'm not sure where you're getting "poorly behaved"; she was literally trying to play with someone in her house. The fact that she wasn't barking or biting the guy should be a telling signal of how well trained and behaved she is, I would think. In other words: the "violent and poorly trained dog" was the one the installer ignored, but the well behaved dog was the one he was afraid of.