For years, Mr. Mutt McCord ran a dog obedience school in Sheffield. He once said the most unpredictable breed was the Chow Chow. As someone who goes into many homes with dogs, my opinion is one of the most vicious is the Chihuahua. Yet due to its small size, we never consider it. As long as you keep your fingers above waist level and don't wear sandals, you're all right.
They are working on the Pit's genome and hope to remove the "vicious" gene, but leave its faithful tendencies.