Rottweilers are a toughened breed of dogs. Originally, they were bred to help with work such as pulling carts and guarding the homestead. They were one of the first dog breeds formally adopted by the police, which still help out in the force today. They are medium in size with a great build and amazing amounts of strength. They are very agile and have high levels of endurance to keep them going. They are also commonly used in many different search and rescue missions by the police and military. This breed is a wonderful combination of strength, intelligence, and endurance. Rottweilers are considered to be fearless, good-natured companions that can beat out just about any breed with their good behavior. This breed is also very alert and can go into defense mode in a matter of seconds when threatened by danger.