In that one then controlled like dog of protection and conduction to him of cattle. These dogs went away changing with the Romans beyond the alpine regions, where they protected people and they lead the cattle. In the region of Rottweil, these units were crossed the native dogs, from which a mixture arose. From then, the main task of the Rottweiler was the one to take care of and to lead greater cattle and to defend to its master and his possessions. Its name: (dog of butcher of Rottweil) it obtained it by the old imperial city of Rottweil. The butchers raised only according to their yield and utility. It went as well as, to the passage of time, a race of protection and superb conduction formed, to which also was him utility like traction dog. When at the beginning of century XX canine races for the police service looked for, tests to the Rottweiler were done to him. One demonstrated quickly that this one dog was perfectly apt for the tasks of the police service. It is why in 1910 police named him officially like dog. The raising of the Rottweiler aspires to a strong race, very vigorous, of black color, with delimited marks brown-reddish good, that in spite of its totally energetic appearance, does not stop being noble, being very appropriate like dog on watch, company and utility.