They are loyal, energetic, friendly and loving to family members. They usually favor one person in particular. They are aggressive to strangers and other people or animals they don't like. Dobermans are very protective of owners and their territory. They are very good guard dogs and are very easy to train. Dobermans are very tough and always fearless to anyone or other things. When they are little, they are easier to train and they like to be active and always doing something.