Find me one dog that attacks with its tail wagging.
As I explained in another thread, unfortunately I did run into a dog that attacked with it's tail wagging. A German Shephard about 20 years ago. He was with his owner at a dog event. He looked like he wanted to play, tail wagging, letting out little yips, stretching out his front legs, hopping, you name it. I asked the owner if he was alright with it, the fellow said, "no problem" and as I stepped toward him to extend my hand his hair on his back stood straight up and he jumped for my face with a vicious snarl. Fortunately the owner was quick and I came away with just a little blood loss. For whatever reason, the dog changed his attitude in that last second.
If you think you can determine what that dog is thinking in three seconds worth of video, you are wrong. My point is not to defend anyone because I was not there. The video points out a few things, but it doesn't tell me just what kind of dog this really was and what the dog was thinking when it bounded from the car. And to say that you, or any one else observing the video, does know what the dog was thinking is simply disengenuous.