You have not been told correctly.Our neighbor has a German Shepherd that mingles freely with his chickens but that is because he trained him properly that they are not to be hunted from the get go. From what I have been told, however, once a dog has killed a chicken they can never ever be trusted again freely around them. Once they have tasted that thrill they will not stop until they feel it again. I suggest a very tall fence or making sure the dog is well restrained in a house/kennel while the chickens are out free ranging.