20 Rare Dog Breeds You Probably Never Knew Existed

18. Neapolitan Mastiff

The Neapolitan Mastiff, draped in folds, echoes ancient war dogs yet lives today as a calm guardian. Towering and heavy, it still shows gentle affection at home. Loose skin once served as armor. Colors include black, blue, mahogany, and tawny. Early, positive social work shapes a steady, polite giant.