Tough call, I think the cop reacted to quickly myself. Yes the dog was closing the distance, but not that aggressively. The cop yells "get back, get back" I dont think thats a command that most dogs would understand. Imo. if that dog wanted him, he would of had him at the back of the car 30 seconds into the video.
Yep, the dog had already walked up to him and smelled him in the yard. Then walks up to him to sniff and say hi again and gets wasted. Cop showing chick how to handle a dangerous situation or was afraid the dog was going to piss his leg.