Poachers on English estates were right to be wary of the Bullmastiff. Bred to track and hold an intruder at bay, his powerful build belies an affectionate, docile temperament. As fearless and confident as he is, you'll not find a more sweet-natured family companion. Your Bullmastiff puppy will be protective of his family, so lots of early socialization with people and other dogs will help him be a happy family member. Beneath that tough-guy exterior is a sensitive, loving heart of gold.