The Dogue de Bordeaux is an immensely powerful mastiff-type guardian. Males can go 27 inches high and 110 pounds. The short, eye-catching coat is a richly colored fawn. The massive head features a Bulldog-like undershot jaw, expressive eyes, and a deeply furrowed brow. It is, proportionately, the largest head in the canine kingdom.
Daniffs are mixed breed dogs, combinations between Great Danes and Mastiffs. Usually, hybrid dogs are created by breeders in order to get dogs with certain characteristics, but often enough they’re simply the product of accidental breeding between dogs of different breeds.
Three Leonberger dogs (one was a female, and two males)  played the main character Buck in The Call of the Wild: Dog of the Yukon (1997), a Canadian rendition of Jack London's The Call of the Wild which stars Rutger Hauer as John Thornton and is narrated by Richard Dreyfuss.
Neapolitan Mastiff. The Neapolitan Mastiff or Mastino (Italian: Mastino Napoletano) is a large, ancient dog breed. This massive breed is often used as a guard and defender of family and property due to their protective instincts and their fearsome appearance.
Saint Mastiff; St. Mastiff; Description. The Saint Bermastiff is not a purebred dog. It is a cross between the St. Bernard and the Mastiff. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed.