The Fila Brasileiro (Portuguese pronunciation: ), or Brazilian Mastiff, is a large working breed of dog developed in Brazil. Fila Brasileiros are known to be naturally protective. They are bred to be aggressive. It is also known for its extreme wariness of strangers and agility when protecting or defending its master. The dedication and obedience of the Fila Brasileiro has found its way into the Brazilian saying 'as faithful as a Fila'.
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