There's not enough info here for me to take a side.

My parents new neighbors had a pitbull that was well behaved, but decided to get a second one. Nightmare animals. It would strain against it's leash tearing up the grass furiously trying to attack you for stepping into your own backyard.

If someone decided to shoot that particular dog to get rid of it, let's just say I'd tell any cops investigating that I didn't see anything.