Bully breeds are dog breeds that have been inaccurately stereotyped as dangerous a nd aggressive. Among the so-called bully breeds are Pitbull, Staffordshire terrier, Boxer, Cane Corso, Rottweiler, Dogue du Bordeaux, Tosa Inu, all types of Mastiffs, Presa Canario, Doberman Pinscher, Great Dane and more. The truth is that any dog can be aggressive. These dogs have been named bully breeds unjustly because of their size and the fact that they are used as guard dogs and in the past, some for fighting. German Shepherds who have the highest number of reported bites against humans are not on the list, thank goodness. You must check because some of these dogs are illegal to own in certain places.