The Cordoba Fighting Dog is an extinct breed of fighting dog. The Cordoba was a crossbreed of English Mastiff, Bull Terrier, English Bulldog, and Boxer. The breed had such strong aggression toward other dogs that the males and females would rather fight than mate. In addition, many members of this breed died in the dog fighting pits, contributing to the breed's extinction. The Cordoba was capable of hunting in a small pack (canine) of a male and female; otherwise it was likely to turn on its pack-mates. The Dogo Argentino is directly derived from this breed. In the 1920s, breeders developed the Dogo by crossing the Cordoba Fighting Dog with other breeds such as the Great Dane, Great Pyrenees, English Bulldog, Bull Terrier and Dogue de Bordeaux.