I carry a Stun Flashlight, or try to most the time. Bought it at Cabelas. It makes a very loud noise when activated, that would be the warning shot. If the aggressive dog doesn't back off, they'll get touched. The nature of the attack determines how long they get touched. My objective is to disorientate the dog so I can get my dogs away. Fortunately have not had to execute my plan, but I have seen enough attacks to prepare. One of my favorite comments in a dog park was a 20 something girl that said just Saturday at the dog park when the her dog was being aggressive. I looked her straight in the eye and said; I hope you can afford the lawsuit I will bring if you dog causes any harm, she got the message. I learned from a friend last winter about this stun flashlight, absolutely a good humane option.