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13. Brazilian Mastiff
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The Fila Brasileiro, or Brazilian Mastiff, is a giant working dog bred in Brazil. Known for its tracking skills, intensity, and bold personality, the Fila Brasileiro can be a great pet for someone experienced with large dogs. This breed is muscular and extremely stubborn. Often territorial, they can be hostile to outsiders or threats. They can weigh up to 99 pounds and may be gentle giants or formidable guardians, depending on their upbringing.
