I have found that properly applied 12 gauge, 7.62x51 NATO, or even 7.62x39 works as well as the gas. I lost count but I think it stands somewhere between twenty and thirty. The Sheriff doesn't even send anyone out to talk to me anymore and hasn't in years. They just remind the caller that it's illegal to let dogs run loose in this county. Just so you know, there are some dogs that come around to visit now and then and I don't mind, as long as they know how to behave...