If you shoot a dog in most localities, you will be brought up on Federal animal abuse charges. The dog can't be threatening to hurt your chickens, it has to actually have one in it's mouth. And BTW, you need to be very careful about shooting dogs. We had a neigghbor who did that and somebody killed half a million dollars of his horses because of it! There have also been people killed for shooting a neighbor's dog. I personally, don't let mine run, but accidents do happen. If anyone killed my dog, I'd kill them in a heartbeat. Not everyone will just accept you killing their dog and you better be willing to pay with your life.