Shop for mastiff wall art from the world's greatest living artists. Ancient and enormously powerful, the Mastiff enjoys global popularity among breeders and dog enthusiasts. The breed's signature floppy jowls and dark faces make wonderful subjects for Mastiff artwork. Adult male Mastiffs can grow to weigh over 200 pounds and stand 30 inches high at the shoulder. Despite an intimidating, muscular physique, the Mastiff is gentle with its family.