 The most widespread theory postulates the possibility that the Campeiro Bulldog originated from Old English Bulldogs (now extinct) that may have been brought to Brazil by European immigrants during the 19th or 20th century.Subsequently, these dogs were bred with the local dogs.A less popular theory suggests that the Campeiro Bulldog might actually be a remnant of the "Bulldog-type" variety of the Fila da Terceira.