38 Dog Breeds That Require Extra Caution and Understanding

13. Brazilian Mastiff

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The Fila Brasileiro, or Brazilian Mastiff, represents a giant working dog developed in Brazil. Known for tracking abilities, fierceness, and bold personality, the Fila Brasileiro can make an excellent pet for someone experienced with large dogs. This breed is muscular and extremely stubborn. Often aggressive, they can be hostile to outsiders or threats. They can weigh up to 99 pounds and might be gentle giants or fierce beasts, depending on their upbringing.