The English Mastweiler is a cross between a Mastiff and a Rottweiler purebreds. They are called hybrid dogs or designer dogs because they are produced by cross breeding of two different pure breeds. These hybrids show features and characteristics of both parent breeds.
The English Mastweiler dogs are large size dogs and they can stand up to 26 inches and can gain weight up to 150 pounds. These large breed dogs are primarily used as guard dogs due to their alert and attentive nature. They are courageous and loyal dogs which make good family pets.