A five-year review of dog-bite injuries from the Children's Hospital of Philadelphia, published in 2009 in the journal Plastic and Reconstructive Surgery, found that almost 51 percent of the attacks were from pit bulls, almost 9 percent were from Rottweilers and 6 percent were from mixes of those two breeds.
In other words, a whopping two-thirds of the hospital's dog-attack injuries involved just two breeds, pit bulls and Rottweilers.
Other studies confirm these statistics: A 15-year study published in 2009 in the American Journal of Forensic Medicine and Pathology revealed that pit bulls, Rottweilers and German shepherds were responsible for the majority of fatal dog attacks in the state of Kentucky.
And a 2011 study from the Annals of Surgery revealed that "attacks by pit bulls are associated with higher morbidity rates, higher hospital charges and a higher risk of death than are attacks by other breeds of dogs."
The authors of that 2011 study go on to say, "Strict regulation of pit bulls may substantially reduces the U.S. mortality rates related to dog bites."