4. Neapolitan Mastiff

They are massive, powerful, and can scare away any intruder that is trespassing on your property. The Neapolitan Mastiff has been used as a guard dog since ancient times.

But besides being a good protector, the Mastino is gentle and loving around its owners.

These wrinkled giants are noble and beautiful. They are great companions for those who live in houses with large yards because this pup needs a lot of space.

Their average lifespan is 7 to 9 years. They are brachycephalic and can suffer from breathing problems. Bone cancer, heart disease, and bloat are other conditions that can shorten the life of this dog.