Crazy neighbour

A good friend of mine recently adopted a beautiful black labbie from a shelter. She's a sweet girlie but likes to bark. Probably because the houses on either side of my friend's have dogs. Makes perfect sense, right? So one day last week, one of these neighbours comes over and threatens to poison this lovely dog with antifreeze if she didn't stop barking. Now my friend is terrified that's what this alcoholic dickwad will do. It doesn't seem to matter that dickwad's own dog barks. My friend called the cops but they pretty much told him that this idiot can't do anything about a dog barking before 11 p.m. but if he poisons the dog, there's not much that can be done until you have a dead dog. I'm simply appalled by this. Any suggestions? —Dog Lover, Alcoholic Hater