I have a pointer/ACD/border collie who killed a chicken when it got out of the run a few months ago. Last week I was gone all day, so when my DH got home that evening he let the dogs out to go potty without checking the backyard. After about 1/2 hour or 45 minutes he looked out the window and saw that the door to the run was wide open (I didn't leave it open, I don't know what happened) and ALL the chickens were out loose with the dogs, and the chicken killer was just lying down on the porch not doing anything. Lucky for me.