The guy who filmed this is the actual dog owner! The cops questioned him but said ok and moved on! Good!Dogs are very faithful creatures and you can see in this video that the owner has a little kid with him. So I think that it is good that the dog is like he is.

The guy calls the dog over as if he was going to pet him and then starts yanking on his collar! He shouldn't have done that and if you can listen real close in the video you will hear him scream! Awesome! Bully a dog and they will bit you! It is that simple!