Terceira Mastiff

Dog breed · Portugal

Overview

The Terceira Mastiff (Portuguese: Cão de Fila da Terceira) is an extinct Portuguese dog landrace, also known as the Rabo Torto (rabo=tail, torto=curled/twisted).

Appearance

Appearance: The Terceira Mastiff was a medium-sized molosser that represented the Fila or Dogo type and resembled the Cão Fila de São Miguel. One of its most remarkable features was an innately short, corkscrew-like tail. Its nose could be either black, brown, or even pink. The colour of the short, smooth coat can be either fawn or yellow, always with a light mask. Red, black and brindle individuals were usually considered to be impure. The height was approximately 55 cm (22 in).

History

History: The Terceira Mastiff came from the island of Terceira, located in the Azores, which is the only island where this dog has ever existed and where it was employed as a house guardian. It descended from the Rafeiro do Alentejo.

In the 1960s, there was an attempt to revive the breed with the aid of the Portuguese government. However, there was disagreement between government officials and breeders, which led to the project's failure. After this, the future of the Terceira Mastiff depended solely on local farmers and breed fanciers. By the 1970s, it was already declared extinct.

It is an ancestor to both the Cão Fila de São Miguel and the Fila Brasileiro. This breed is different from the Barbado da Terceira.

Every pet is one of a kind. This guide covers what's typical for the breed, but your own dog or cat will have their own personality, quirks and needs — think of it as a friendly starting point, not the final word. Whenever you'd like advice tailored to your companion, the team at OC Pets is always happy to help.
Sources (reused under open licences, with thanks): Wikipedia — “Terceira Mastiff” (CC BY-SA 4.0) · Wikidata (CC0) · image (Public domain, via Wikimedia Commons) · Compiled by OC Pets Veterinary Clinic, updated 15-06-2026.