The Original Fila Brasileiro (OFB) or Old Brazilian Mastiff is a rare working farm dog breed from Brazil. The breed developed precisely in the routes of the exploration areas of these ores – in the cities, farms and commercial areas that existed due to the exploitation of this economic activity interconnected different regions – and were places with constant flows of people, and consequently, of dogs. Brindle Original Fila Brasileiro dog, 2018. With the current rescue work – of which there are canine behavior experts adept at the project – the original temperament of a brave, intelligent, self-confident dog averse to strangers (with the genuine 'ojeriza' of the old Fila dogs) is being prioritized, as well as the use of professional dog training, still unprecedented in the breed.