While I fully support responsible firearms ownership and carry by a huge margin, I also gotta say, not the best option for defense against a dog. Dogs are fast and small(er than a human), harder to hit, and you’re legally and morally responsible for misses. The best against dogs, and what I carry/carried for dogs (specifically dogs, had something else for deadly human threats) when delivering pizzas was a quality OC spray. Dogs can’t fight through it like some people can, it’s really effective and the dog’ll be fine.