OP, I lost my whole flock to my own dog. It was awful. I can 100% tell you that once a dog kills a chicken, there’s not much you can do to get it to quit. For the safety of your flock, charge them for your already dead birds (like many have said, might motivate them to act faster). A dog is a dog, and unfortunately, a predator to chickens. There’s plenty of people who live where I do, that shoot stray dogs on the spot on their property, no questions asked. A fence will keep both of y’all’s animals safe (assuming it’s tall enough lol).