The Cordoba Fighting Dog is an extinct breed of dog. The Cordoba was a crossbreed of Mastiff, Bull Terrier, Boxer, and Old English Bulldog. The Cordoba Fighting Dog originated in Córdoba, Argentina. 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.