I have bird dogs, a lab and a German Shorthair. They will never be in the open with my chickens. Why? Because chickens are birds and bird dogs hunt and retrieve birds. Their nose knows the difference between a duck, a pheasant and a chicken, but their eyes see a bird. Can't and won't try train not pursuing chickens, because they are trained to hunt birds. Besides, if training them not to chase chickens work as well as training them not the chase cats, I wouldn't have any chickens left.