Trouble with neighbors dog...
Hey Dart, next time you go to a gun show, check out the small personal tazers... There's a Chinese brand that sells like hot cakes and they've got a good 50,000 volts on tap. In fact, when it fires, it will scare the sh_t out of anybody within 15 ft of it. It's funny to watch.
You won't have to actually use it, but I can tell you that when that thing "cracks" they will high tail it outta your "space". Of course, it the dog was aggressive enough, I'd just tap him on the snoot, which would probably make him sh_t himself...as he vacates my space. Plus, since they're legal, you won't get in any trouble over it.
Another option is a bottle of Ammonia. Hose 'em in the snoot with a shot of that stuff and they''l be looking for an exit strategy. I used to use that when a neighbors Rotty would try to separate me from my motorcycles when cruising thru the neighborhood. After you hit 'em the first time, all you have to do is hold your hand out like you're going to do it again, and they "remember".
Southernman