Hiker- So sorry about your cochins. The best thing, just keep the dog under control at all times. I have a dog, cutest lil choc lab you've ever seen. When I first got chickens 2 years ago I thought I would train her as a livestock dog. I showed her peeps when we first got them, she played with them and I really trusted her with my chicks. Well one day ginger ended up killing a chicken. Honestly I think it was by accident, but to her it then became a game and now I honestly can't trust her. I still love and adore my ginger but she is always kept on a lead when she is not with me and not around the chicks as she was before. Dogs are meant to hunt, especially if you have a hunting breed and just can't get rid of the instinct.