Aggressive neighbor dog!

Our neighbor two doors down has a huge rottweiler that stays gated on her deck. When we were moving in he got loose and came over here and was growling at us. Our next door neighbor said "don't let him near your dog, he is very aggressive". Well, at that point I was ready to move again. But he didn't get loose again for quite awhile.

Then the other day I had Dex out in the back on a leash and I heard a low pitched bark from the side yard. I shoved Dex in the door (thank goodness it wasn't mid-poop :shock: ) and sure enough, there came the rott around the corner into my back yard! Then Kevin had the same thing happen to him and he took a chair from the deck and banged it on the deck to scare him away. I've started taking a tire tool out with me. I can't imagine hitting a dog, but I believe I would if I had to. So last night, Dex is going crazy growling at the front window, and I look out to see the rott coming up my side yard again. I looked the lady's number up and at 11:00 p.m. got her out of bed to tell her to corral her dog. She said "oh, he's not aggressive" and I corrected her. She came out and yelled for him and he went home. Maybe now she will keep him in but I doubt it. There is no animal control officer in this small town. I am about to call the mayor on it.

What would you do?