What two dogs make a bull- mastiff?

The Bullmastiff breed, is a combination of the Mastiff and the Bulldog. This breed was in created in England around 1850 and it's the only guard dog created there. The Alpine Mastiff was an extinct breed originating in Switzerland but the Saint Bernard was also known as the Alpine Mastiff. America has it's matiff called The American Bandogge Mastiff which looks like a mastiff mixed with pitbull and even share the blue color of the pitbulls. The Argentian dogo is also called the Argentian mastiff.

This is to show that the mastiff breed was paramount for developing the kinds of mastiff breed around the world.