Known history of the Bullmastiff begins about the year 1860 in England. Bullmastiffs are large, powerfully built, but agile dogs. They have short coats that come in fawn, red, or brindle shades, and have a black mask. Their large heads are a striking feature, with keen, alert, intelligent expressions. To strangers they are rather standoffish, but they are loving toward their owner. Bullmastiffs are normally very gentle, cheerful and calm.