I hate hearing stories like this. Definitely relay your concerns to
animal control and/or the police. If you're going to put fliers up,
do NOT mention this guy's name. Sounds like he's trouble enough
without getting the idea that he needs to get a lawsuit going. And a
pit bull is actually a bad idea. I'm not saying that pit bulls are
inherently evil, or that this won't keep cats out of his yard, but if
a feral strays through that area, it could be a death sentence. I'm
assuming that since the guy is a huge jerk, then he'll do his best to
train the pit bull to be a jerk, too.