If it gets to the point that you have to shoot a dog, you are best off to follow the 3S rule, shoot, shovel, and shut up. Anything else will get you involved in lawsuits, vendettas, vet bills, and too much grief. My neighbor back on the farm interrupted 2 Rottweilers eating his purebred breeding boar alive, inside his barn, inside the pen. He shot and killed them but was foolish enough to tell their owner. And in that state/area it is legal to kill a dog that is "harassing livestock". Long story short, although the dog owner did not win the lawsuit, my neighbor spent several thousand dollars in lawyer bills. When I've had to shoot a dog, and I've always tried to catch them and turn them over to the dog warden first, I've taken off any collar and tags and gotten rid of them and buried the bodies deep.