The Ultimate Mastiff was created by mixing together various Mastiff breeds including English, working Neapolitan, Bull, South African Mastiff, and other mastiffs including small amounts of Dogo Argentino, Boxer, Cane Corso, Great Dane, and Rottweiler. The result is an undyingly loyal, but stable temperament dog. They only act fierce and only when absolutely necessary. Aggression towards humans or petsaren't breed traits. This one sports the "blue" coat. #dog #mastiff #UltimateMastiff #fictional