Why is a Rottweiler also called a Riot Dog

One, bold, Rottweilers are very bold, hear the sound of a gun can be lofty, not afraid at all, unlike some dogs hear the sound of car sirens are scared to urinate. Two, adaptability, no matter what kind of working environment, it can adapt, very powerful. Third, excellent physical quality, strong, imposing, very intimidating, pull out the timid people are estimated to have to turn around and run, do not dare to appear in its line of sight.