# From 1979 to 1998, at least 25 breeds of dogs have been involved in bite related deaths. Pit Bulls and Rottweilers were involved in more than 50 percent of these incidences.
# In a study reported by a retired professor from California State University at Chino, Robert Plum, it was found that one dog in 55 will bite someone seriously during the course of a year. With respect to breed differences in the tendency to inflict serious injury, Plumb estimates that when a pit bull bites a human, one in 16 (e.g. 1/16) will inflict serious injury; this contrasts with a ratio of 1/296 Dobermans, and 1/156 German shepherds.