The breeds most likely to kill
As of May 25, 2013, the USA death count from dogs in 2013 is 14. Of these, 13 people were killed by pit bulls. In recent years, the dogs responsible for the bulk of the homicides are pit bulls and Rottweilers:
The Clifton study of attacks from 1982 through 2006 produced similar results. According to Clifton study, pit bulls, Rottweilers, Presa Canarios and their mixes were responsible for 65% of the canine homicides that occurred during a period of 24 years in the USA. (Clifton, Dog attack deaths and maimings, U.S. & Canada, September 1982 to November 13, 2006; click here to read it.)