People who think they are like any other dogs or are often vicious and dangerous are for the most part wrong. It is true that any dog that is mistreated or not taken care of can become dangerous. Viciousness is a learned behavior and few dogs, including the Doberman, are naturally vicious. Dobermans can be protective and guarded or they can be sweet and eager to please. To get the desired temperament, training should start when the dog is about 8 months old.