I know I'm jumping in way late on this but about 14 months ago my newly acquired boyfriend brought 2 roosters and 2 bum hens over to my house. My 2 corgis eventually devoured the hens. One would always go crazy about songbirds but he was neurotic anyways. No hard feelings towards the dogs. They never tried killing another chicken when I moved them to my boyfriend's farm. Sadly, I lost them both this past year. I have 2 new corgis (rescues) and they don't appear to be a risk to chickens.