Rottweilers are a robust, powerful dog breed with great strength, endurance and agility. The Rottweiler is a working dog, he is the happiest when there is a job to do whether it is herding, competing in obedience, tracking, search and rescue or retrieving the newspaper. An effective guard dog, Rottweilers are also dominant and pushy - and requires constant training firm, uncompromising rules. A Rottweiler will defend his family and property to the end, but he does have a tendency to become loyal to one person.