The Neapolitan Mastiff, or Neo, is a giant Italian guardian descended from farm and estate dogs near Naples. Loose skin, heavy facial folds and a hanging dewlap give it a look that's hard to forget, and the short coat comes in gray, black, mahogany and tawny. Adults commonly weigh 110 to 160 pounds, and the rolling walk reflects bulk rather than speed.
Many Neos are calm, loyal and happy to doze most of the day, but they stay wary of strangers and guard by presence rather than noise. Early socialization and steady, reward-based training matter with a dog this strong. Expect heavy drool, a lifespan of roughly 7 to 10 years, and real planning around heat, though each dog's personality and needs differ.