I read elsewhere that the officer was returning the ID after being at the house for a prior incident an hour earlier. Just wonder if it had any bearing on this?
If that's true then it might have.
I had a dog once that regularly bit at the heels of a friend who came to the house. He never did this to anyone else. It just so happened that this friend was a meter reader who threw rocks at dogs.
Dogs have a sixth sense for things like that. And in this case the dog obviously had this officer pegged as potential trouble. The dog turned out to be right by paying for it with his life.