http://www.helium.com/items/98239-dog-breed-bullmastiff

The Bullmastiff dog is recognizable, from breeding of Bulldog (40%) and Mastiff (60%), in England, during the late ninetieth century. Originally, known as "gamekeeper dog" because the breed accompanied gamekeepers, for their ability to track and overpower a poacher, and having the ability to be tough, fearless and silent. In 1933, the Bullmastiff was recognized by the American Kennel Club, and prior to being breed in England, starting in 1925.

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