Tying the chicken to their neck WAS a common method, and according to alot of old timers, it worked. Kinda icky for my taste, but to each his own. Our dog killed a chicken several weeks ago, we caught him in the act, whacked him with the dead chicken while scolding. Not in favor of hitting a dog generally either, but in this case, he saw it more as the chicken was attacking him I think. He definitely got the idea. Then we kept him on a leash for about a week or so, taking him out to do chores twice a day. Made him lie down on leash amongst the chickens and let them roost all over him. We also locked him in the barn with them at night (they were of course, protected by a hardware cloth pen) He now demands to sleep in the barn with them at night and lies in the grass amongst them all day while they range aorund him. It has been nearly a month since we quit watching him by them and he hasn't bothered them a bit, not even the babies. Making your dog see them as part of his "pack" just like humans and other animals that live there might make a difference. Granted, all dogs are different, and for some, a really high prey drive might be too much to overcome, but it is worth a shot.