If the approaching person does not back down, they take immediate defensive action. It is because of this instinctive behavior that English Mastiffs have earned themselves a spot in the world's top 5 guard dogs.
The breed is innately good natured, calm, easygoing, and surprisingly gentle. It is a well-mannered house pet but needs sufficient room for exercise and activity. The Mastiff is an extremely loyal breed, exceptionally devoted to its family and good with children.