That dog was dead instantly, it was hit in the head. The tail wagging for all that time is just uncontrolled impulses.
I would hope so! No clue for sure, wasn't there. I have seen stuff suffer and I have seen nerves.
Because then it would be an illegal discharge of a firearm....mercy killing or not. He shot till the threat stopped. He can't just decide to put another round in for the hell of it.
Oh, the discharging a firearm towards bystanders ok? But the put it out of misery shot is over the top? Got it!