Sorry, the article says the dog was on the owner’s property. Our dogs are trained to stay in the yard. Second, many people these days have invisible fences, but if an officer is dumb enough to walk into the yard without permission...?
That is not a negligence issue on the part of the owner, it is a stupidity issue on the part of the officer.
Not stupidity. Overwhelming arrogance and the knowledge that there are never and personal consequences to police for killing peoples' pets (rarely any consequences for police killing people for that matter.)