A Scary Neighbor

I'm not sure this is the right place to get on this manner. I think you should talk to a lawyer and get some advice on your legal rights. Report any harassment or mistreatment or mismanagement of his dogs to the police. Keep a running log of the behavior so as to build a case for harassment including dates, times and photographs. You may also consider security cameras and a privacy fence. You will need a pile of evidence to prove harassment.

The other part of this issue is something you can learn to control. Right now, by paying attention to his behavior, you are playing into his hands. He is harassing you to get under your skin and he's succeeded. I suspect your behavior towards him has convinced him it's working so he does it all the more.  I'd suggest that you make some effort towards ensuring your security, perhaps like I suggest above and then do the best you can to ignore him. He can't harass you if you aren't paying attention. I know this is easier said than done, but it will be worth the effort. You have control over your reactions. Practice managing your thoughts and feelings about his behavior until you start feeling better about it all. 

Another strategy to consider is behaving towards him in a friendly manner. Say hi, comment on his garden, his guns, and anything else you can think of in a friendly engaging manner and a smile on your face. Laugh at his insults, don't respond in kind. Make light of it and demonstrate how entertaining his antics are. He will soon tire of efforts to harass since it's obviously isn't working and look for other victims.