I have 2 labrodoodles that could care less about the chickens. One will even come into the pen and lay down when I'm in the coop. You'd think being part lab, they would want to kill them. Maybe because I had the peeps in the basement until about 7-8 wks old and let the dogs smell them every day while I held them, I don't know. I have a new St Bernard pup and can't tell yet what she'll do if the chickens are out. It's too cold here right now, and we'll just have to wait and see but I won't let her around them for quite awhile yet.