22 reported dog bite related human fatalities in the United States in 2004. 2005 - 29 human fatalities. 2006 - 26. In 2007, there were 33 human fatalities. 45% of the attacks occurred to adults over the age of 18, and 55% occurred to ages below. Pit bull type dogs were responsible for 67% of fatalities, the next closest breed was the rottweiler at 12%. But all dog breeds are potentially dangerous. In 2000, the Centers for Disease Control (CDC) reported that 25 breeds of dogs were involved in 238 fatal dog bites from 1979-1998. Here it is the compiled list of the most dangerous dog breeds: