25 Dog Breeds That Could Be Too Dangerous for Your Home

18. Neapolitan Mastiff

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Dripping with folds and towering in stature, the Neapolitan Mastiff looks fearsome but loves softly. Descended from Roman war dogs, this 150 pound guardian is calm, affectionate, and steadfastly protective when socialized early and trained with patience. Its lumbering gait hides bursts of power that deter intruders without the need for aggression.