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13. Brazilian Mastiff
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The Fila Brasileiro, or Brazilian Mastiff, is a giant working dog from Brazil. Famous for tracking, fierceness, and boldness, the Fila suits owners experienced with large breeds. Muscular and extremely stubborn, they are often aggressive and hostile to outsiders or perceived threats. Weighing up to 99 pounds, they can be gentle giants or fierce guardians, depending on upbringing.
