Any dog can be a danger to humans. It is important to never completely trust any dog or pet.
But, here is the big difference in regard to pit bulls vs. other breeds.
Again, from the April 2011 edition of Annals of Surgery, Volume 253, Number 4, and is entitled "Mortality, Mauling, and Maiming by Vicious Dogs."
- "Pit bulls not only are notorious for their indiscriminate attack pattern but also as well known for the tenacity with which they continue to attack.
- "The inbred tenacity of pit bulls, the unrelenting manner in which they initiate and continue their attacks, and the damage they cause are the result of both genetics and environment. Therefore, this breed of dog is inherently dangerous."
- "As stated by one author, 'Temperament is not the issue, nor is it even relevant. What is relevant is actuarial risk. If almost any other dog has a bad moment, someone may get bitten, but will not be maimed for life or killed, and the actuarial risk is accordingly reasonable. If a Pit Bull Terrier or a Rottweiler has a bad moment, often someone is maimed or killed, and that has now created off-the-chart actuarial risk, for which the dogs and their victims are paying the price.'"
- "If the risk of a fatal attack is normalized to Labrador Retrievers and Labrador-mix breeds (the most common registered dog in the United States), the relative risk of death related to pit bull attacks is more than 2500 times higher."