I have a German Shepard mix (female) that just turned a year old. In early summer of last year, she massacred part of my free range flock and we did everything we could to try to teach her not to kill the chickens. She went a long time without doing it until just a month or so ago when hens were turning up dead. At first I assumed it was a raccoon or some other wild hungry predator, until I caught her red handed playing with one that was still alive. Getting rid of her is really last resort, because she is the pet of my twin 6 year old daughters, so if anyone has any advice as to how to get her to stop, I'd really appreciate it. BTW, she already knows she is not SUPPOSED to do it because she goes out of her way to avoid the chickens when I am anywhere around.