Sadly, anything you do, including suing him in civil court will give him in his mind, retaliation rights. And really, do you have any way to collect a judgment if you get it? If he's a skeev with meth connections and an ugly pack of dogs, I'll bet he's going to turn out to be judgment proof. You say he has "gone to court" before. How did this turn out? Do you know if he was charged, cited, fined on these occasions? When you say "we have got...." who is this? You, your family only, the other neighbors? Letters from whom? Petitions signed by whom? I would recommend you see some local legal counsel to discuss this with.
Seven years is a long time to put up with bad neighbors with vicious dogs, and around here, even if there's a suit it never comes to much except more bad feelings. You sound enraged and totally frustrated, it's probably good you do not have a gun, as people like this are NOT worth the hassle it would be if you fulfill your fantasies and shoot something or somebody. But be sure you discuss with the attorney restraining orders and how to best protect your family if this gets to be more ugly.