 The Fila da Terceira was a Portuguese dog breed that originally lived on Terceira Island.These dogs were an outcome of the cross between the Spanish Mastiff, Portuguese Mastiff and the old Dogue de Bordeaux (which is different from the current breed).Later, during the 17th century, the Old English Bulldog was introduced, and it was the original "Bulldog-type" variety with reduced size, as compared to the "Mastiff-type" variety (without Bulldog insertion), bearing the characteristic crooked tail.