The Portuguese name, meaning 'dog from Castro Laboreiro', refers to a small town in the far north of Portugal, now a parish in the
Melgaço urban area. It is in the same mountains as the
Peneda-Gerês National Park. Although now served by modern highways, the mountainous, rocky area was once quite remote. The modern breed is descended from a very old
livestock guardians, which worked with livestock herders in the mountains, defending against wolves and other large predators. The origin of the breed is not known, although many legends are given. The Portuguese breed club notes that "Everything that is written about their origins is pure fiction, without any scientific or historical accuracy ... data is rare, or does not exist ... most guardian and herding breeds do not have records before 1900". There are mentions of the Castro Laboreiro in the 19th century but none before 1800.
Camilo Castelo Branco in his novella
A Brasileira de Prazins (1882) mentions "the dogs of Castro Laboreiro, very fierce ..." It is said to be "ferocious against wolves." The Castro Laboreiro Dog is recognised by the FCI in Group 2, Section 2.2: Mastiffs, Mountain Type, Portugal (breed number 150). It is also recognised, under its Portuguese name, by the
United Kennel Club in the United States, in their
Guardian dog group. It may also be listed under the name , similar-sounding names, or different English versions of the name (such as Portuguese cattle dog or Portuguese watchdog) by large commercial breeders, minor kennel clubs that require little to no breed verification for registration, and Internet-based dog registry businesses, where it is promoted as a
rare breed for those seeking a fashionably novel or unique pet. Nevertheless, the number of specimens of this breed does not exceed 500 in the whole world. In Portugal, there are a half-dozen breeders, plus a couple more elsewhere in Europe (in United Kingdom and Germany), and one in the US. == Appearance ==