[Peeps47]

The scariest dog I ever came in contact with was an adult male Neapolitan Mastiff. He was sitting down and his humongous head came up almost to my chest. There was a chain link kennel between us but he looked like he could walk right through it. I was at the kennel to buy the smaller mastiff called the Cane Corso. He was a great dog.

[CommerceComet]

The scariest dog I ever came in contact with was an adult male Neapolitan Mastiff.

It sounds like the scariest breeds around are the bully kutta, Tibetan mastiff, and ovcharka. All are very large, aggressive, and have dominance issues. Even experienced dog handlers find them a handful. Fortunately, all are rare. Unfortunately, the breeds are becoming more popular among those who think they have to have the biggest, baddest dog in the neighborhood.