The Neapolitan Mastiff is highly protective and fearless. It was developed to look and act fearsome when needed, but is affectionate with its family. This breed is extremely intelligent and somewhat willful. It is serious, calm and quiet unless provoked. However, this dog is very loving with children, provided they do not tease it.
The female makes a better family pet, as she is more submissive to her master and better with children, but children should be taught to respect this dog. The Neapolitan Mastiff is very wary of strangers and it makes a very good watchdog and guard dog. The male does not get along with other males, but the Neo can get along well with non-canine pets if raised with them from puppyhood.
Additional protection training is unnecessary because it is a natural guard dog. Thorough obedience training is highly recommended. The Neapolitan Mastiff is not a breed for everyone; it requires an owner who knows how to display strong leadership and who is willing to spend a lot of time socializing and training. You will achieve the best results with patient, consistent training.
If you have the right personality to handle the Neo right, you will get a powerful guardian and a loving and loyal friend at the same time, who will always be there to offer companionship.