This breed is an ancient one, and its history stretches back to the Roman Empire. The principal ancestors of the first Rottweilers was supposed to be the Roman war dog, local sheepdogs and dogs with molosser appearance coming from England and The Netherlands. The Rottweiler is not usually a barker. Males are silent watchers who notice everything and are often quite stoic. Females may become problem barkers in order to protect their den.Barking is usually a sign of annoyance with external factors (car alarms or other disturbances). Their forehead may be wrinkly when alert.