13. Brazilian Mastiff
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The Fila Brasileiro, or Brazilian Mastiff, is a giant working dog bred in Brazil. Renowned for tracking, fierceness, and boldness, the Fila can be a great pet for experienced large-dog owners. This breed is muscular and extremely stubborn. Often aggressive, they may be hostile to outsiders or threats. Weighing up to 99 pounds, they can be gentle giants or fierce defenders, depending on upbringing.
