The Neapolitan Mastiff is a noble, astounding dog. This breed was originally bred in Italy and was commonly used as a guard dog, meant to deter intruders with its intimidating look and size. Quick to learn and excellent with their families and children, the Neapolitan Mastiff is protective and devoted, generally has a low energy level, and has abundant, hanging wrinkles and folds on its head. These dignified, powerful dogs weigh between 130 and 155 lbs. in adulthood, and thrive when given plenty of property to roam and defend.