Dobermans generally begin to become aggressive at four months of age and will become more short-tempered and aggressive towards other unfamiliar dogs. If the Doberman was raised from a young age, then at four months of age he will begin to act defensively when his owner is threatened. Therefore it is important to keep a leash when walking in the neighborhood at this stage to avoid conflicts with residents and other pets. It is best for owners to start doing simple command training when the Doberman is 3 months old as a way to regulate his behavior. The Doberman Pinscher is a large dog, capable of being not only a hunting dog, but also a guard dog. It has a strong muscular and alert personality, so it can appear to be fierce, and needs to wear a leash and muzzle when going out.
