Getting a large livestock guardian dog is a good, yet expensive start.
Practice safe shooting skills until you're able to put 3 rounds in a 3 inch circle at 100 meters with soft or hollow-point hunting rounds. While unpleasant, it will help to ensure a quick, humane kill.
Post "No Trespassing" and "Trapping" signs on your property boundaries, but DONT SET TRAPS and don't tell anyone you don't set traps. While predators can't read them, dogs owners can.
Talk with your neighbors and politely let them know that whatever happens, its not personal, you're just protecting your property.
I know it sounds harsh, but it works for me.