38 Dog Breeds Known for Their Dangerous Traits You Should Be Aware Of

13. Brazilian Filter

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The Fila Brasileiro, or Brazilian Mastiff, is a large working dog known for its tracking ability, loyalty, and fierce protectiveness. These dogs are muscular and stubborn, often wary of strangers. They are best suited for experienced owners who can provide firm, consistent training. Without it, the Fila Brasileiro can become aggressive and difficult to manage.