C17 -- I had two dogs before I got chickens. The dogs didn't bother the chickens for eight months even when left alone all day with them free ranging. One day, I came home to carnage. After that, I kept the chickens out during the day and the dogs out at night. That worked out, but I still lost a couple due to carelessness on a human's part, sometimes mine, sometimes the kids. One of the dogs died and the other again seems to care nothing about killing chickens. I will let him out when we are outside but don't trust him completely. The chickens will often fly into his pen and eat his dog food. He growls and snaps at them (I don't blame him) but so far has not killed anymore. I did no training with the dog specifically to leave the chickens alone, I think he just figured out that I don't want them killed. He could kill more today and it wouldn't surprise me, all I am saying is that even if the dog can't be retrained, it can still be done. You can keep chickens and a chicken killing dog at the same time. You just have to understand what has to be done and accept that you can't be lax, because chickens will die. Build a dog-proof coop/run, and a dog-proof dog pen and make a schedule.