Terceira Mastiff
The Terceira Mastiff, or Cao de Fila da Terceira, was a Portuguese cattle and guard dog from Terceira in the Azores. Historical descriptions portray a powerful molosser used to grip and drive difficult cattle, with a broad head, strong neck, brindle or fawn coat, and a short or twisted tail that led to the nickname rabo torto. It is generally treated as extinct, or at least not surviving as a verified pure breed.
Modern references to the Terceira Mastiff are mainly useful for breed history, Azorean rural heritage, and studies of Iberian and Atlantic working dogs. Claims of living pure examples should be checked carefully, since descendant dogs, look-alikes, and reconstruction projects are not the same as an unbroken population. A dog of this working type would have required experienced handling, secure space, and firm management around livestock, strangers, and other dogs. Researchers and buyers should separate historical identity from modern marketing.
