I had my dog kill a chicken, it didn't get into the run, the chicken escaped, and my dog acting on instinct, killed it. I have a very secure pen, and if she could get in she would. It would never be safe for any chicken to be loose with her, but like I said my run is very secure. In answer to your question, I think the dogs are not safe around loose chickens, but if they are in a very secure area it might work. I don't think its fair to "get rid" of the dog based on it killing a few chickens....most dogs do that sort of thing..its a predator vs prey kinda thing