The Argentine Dogo is a mastiff-type breed which was developed in the 1920s by Dr Antonio Nores Martinez and his brother for hunting large game such as wild boar and cougars in packs. The breed was developed by crossing the Cordoba Fighting dog with multiple breeds to increase size and hunting instinct, as well as reduce the aggression within the breed in order to make it both a loyal family dog and cooperative pack hunter. Dogos with a black patch over one eye are known as piratas (Pirates). Against their nature and the breed standard, some Argentine Dogos have been crossbred for use in fighting, which has given them a bad press in some countries and led to the breed being banned in Australia and the United Kingdom. This breed has been a member of the American Kennel Club foundation stock service since 1996.