The Rottweiler is calm, trainable, courageous, and devoted to their owner and family. They have a reliable temperament. Protective, he will defend his family fiercely. These are strong fighters that seem immune to pain. Serious, steady and confident. Firm and careful training is essential for this breed, otherwise you may end up with a very powerful and overly aggressive dog. Yet they can, with proper handling, also be loyal, loving and very rewarding companions. They require owners who can handle their massive size. The Rottweiler is a natural guard dog with a mellow temperament. They are highly intelligent and have proven their worth beyond question in police, military, and customs work over many centuries.