I think Jake is probably doing the best he can. A lot of us on the sidelines who love dogs, which includes me, would be happy if he would go over an wring the guy's neck. But then Jake's life would be ruined, and his dog would still be gone. Or maybe the neighbor would turn the tables and wring Jake's neck, and claim self-defense. No, the only reasonable course is what Jake is doing: try to get law enforcement interested in prosecuting it, or if they're not interested, sue the guy if he can find a lawyer that thinks he wouldn’t just be wasting his money. You do your best, and then move on.