No, it isn't inconclusive, in the least. It's very clear the dog wasn't attacking. What isn't clear from the clip is what kind of dog this was. It's a moot question, anyway. The truth is this yahoo had three seconds to panic. He could've been shooting at a pug, for all he cared or could even tell.
I don't think it's okay for cops or anyone else to shoot an innocent dog.
That's not what you implied, but we are not in disagreement, here. "If a dog happens to be a pitbull it's guilty regardless", is what I took from your post. If you've changed your mind, good. If not, I won't respond to you anymore.
The worst thing is the treatment of the family.
Yes, it was horrible, especially for the kids. You know what? The worst thing that happened to this family was seeing their dog's head blown clean off. Don't watch the video; listen to the pain and anguish of these people when they realize their dog had been killed. You'll see what I mean.
Until we have cops that are paid a decent wage out there, we will continue to have incidents like this.
I don't think money is a factor, here. There's quite a few fine cops where I live, and some very bad ones. The bad ones aren't paid any less than the good ones. Until we value common sense and decency over procedure and butt-covering, we will continue to have more incidents not only like this, but where humans beings continue to be killed as well.
Your question "what would you do," in a situation as you described it? Well, I'm not a cop...but, about a month ago I stopped to pick up two mixed breed dogs running in the middle of a street. They were very close to getting hit by a car. They came running up to me, wagging their tails and smiling. I didn't shoot them, but then I didn't have a gun nor do I have any training in "proper procedure."