I'd send a note back.
"Thanks for the warning. In the future I will shoot your dog on site if it is loose on my property. I do not do this lightly but instead I am being forced to do this in self defense."
Hmmmm....well, the idiot neighbor has admitted that the dog IS dangerous. What are the homeowners supposed to do...WAIT until it starts mauling someone on their property? I would hate to have to shoot an animal, but...
I suggest again that you need to contact a lawyer for some advice. What are you legally allowed to do to protect yourself and your property and your loved ones. Are you within your rights to shoot a known vicious animal if it is on your property, if it is loose in your neighborhood?
For instance, if you are out getting your mail, and you see Biter-Dog running toward you, what are you legally empowered to do? Mace him, pepper spray him, air-horn him, etc.
Since you anticipate a slow reponse time, maybe you could get a BIG Have-A-Heart trap & attempt to trap the dog. Then he'll be contained & be there when the animal warden/state police/dog catcher does finally show up. Just a thought.
agnes!
?
, have a talk with the lady and assess any real danger before we start dialing 911 over a "maybe" problem. Geez people get a grip.
