20 Mysterious Dog Breeds Most People Never Knew Existed

18. Neapolitan Mastiff

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The Neapolitan Mastiff is known for its loose, wrinkled skin and enormous size. With roots in ancient Rome, these dogs have a prehistoric appearance. They are gentle giants, weighing up to 150 pounds and standing 24 to 31 inches tall. Their wrinkled faces and droopy skin once provided protection in combat. Despite their intimidating appearance, Neapolitan Mastiffs are loving and gentle with family. They are protective but rarely aggressive without cause. Their short coat appears in black, blue, mahogany, and tawny. Early socialization and positive training help manage their strong-willed nature.