When training a Mastiff, it is important to recognize they have a certain personality type that needs additional time and patience to learn things. A Mastiff is a very relaxed dog and takes his or her time in doing a task. Owners call this the "Mastiff tempo". A Mastiff can't be trained the same as a Border Collie. In temperament, a modern Mastiff is a patient, sweet-tempered family guardian and companion. Gentle training works best. It is important to start that training early in puppyhood. They are a dog of tremendous size and strength and owning a Mastiff is a large responsibility.