According to NBC, the Top 10 Most "Dangerous" Dog Breeds are...

Pit bulls
Rottweilers
German Shepherds
Huskies
Alaskan Malamutes
Doberman Pinschers
Chow Chows
Great Danes
St. Bernards
Akitas

IMO, any dog is dangerous if they are left unsupervised. The only two breeds on their that are considered "deadly" are pitbulls and Rottweilers - the others are more for the damage they can do if they bite someone.

*EDIT* This means that you can add pictures of Bailey (Great Dane), I have a bunch in threads I made about him. My innocent little puppy in the top 10. He is so vicious! LOL!