Always report vicious dogs. If there are enough incidents, the dog owner may be banned from owning dogs. Talk to the idiot's father. He may have more common sense than the son, especially if you remind him that, since it's his house that the dog lives at, he is liable for harboring them. Make sure that they also know that the dane will be shot on sight if it's ever in your yard again. Let them think that you are the crazy, mean neighbor. Let them be afraid of you rather than vice versa. I have nasty dog owner neighbors too. We all ended up in court. I won. They also know that I will shoot their mutts on sight if I see them on my property again. I refuse to live in fear of my neighbors. I just let them think that I am crazier and meaner than they are. That policy seems to be working for me. Intimidation has been their way with other neighbors, but they seem to be giving me a wide berth.