Bullmastiff Custom ComboBuild Your Own Bullmastiff Custom Combo Any Combo of Butters for Your Bullmastiff Bullmastiffs are an amazing combo of Bulldogs and Mastiffs. The actual proportion was 60% Bulldog and 40% Mastiff. That math always makes me smile. Like many other dog breeds with Bulldog genetics, the Bullmastiff often has rough, dry nose problems. Bullmastiffs also struggle with annoying elbow calluses, rough paws, and the occasional itchy skin frustration. Mix and