2. Cane Corso
This breed does appear to be quite intimidating on first glance. The Cane Corso is a pretty big dog - muscular and strong. It's very common for these dogs to have black or gray fur, but there are those who wear different shades of brown flawlessly. Some have cropped ears, but on most occasions their floppy ears are left to hang. As great guard or hunting dogs, these beautiful dogs are known to be Italian bred and related to the Neapolitan Mastiff.