Originating more than 400 years ago in Brazil, the Fila Brasileiro, also called the Brazilian Mastiff, is a working breed. As the national dog of Brazil, they are used for tracking, hunting, protection, and herding in their native country. The Fila is renowned for its bravery, loyalty, and natural protectiveness. Although Filas is regarded for their submissive behavior in the home and for forming strong ties with their family, if not trained properly, they can become violent.Average lifespan nine to eleven years.