The most recent official survey determined there were 4.7 million dog bite victims annually in the USA. Another study showed that 1,000 Americans per day are treated in emergency rooms as a result of dog bites. In 2007 there were 33 fatal dog attacks in the USA. Most of the victims who receive medical attention are children, half of whom are bitten in the face. Dog bite losses exceed $1 billion per year, with over $300 million paid by homeowners insurance.

Merritt Clifton, editor of Animal People, has conducted an unusually detailed study of dog bites from 1982 to the present. The Clifton study show the number of serious canine-inflicted injuries by breed.

According to the Clifton study, pit bulls, Rottweilers, Presa Canarios and their mixes are responsible for 74% of attacks that were included in the study, 68% of the attacks upon children, 82% of the attacks upon adults, 65% of the deaths, and 68% of the maimings. In more than two-thirds of the cases included in the study, the life-threatening or fatal attack was apparently the first known dangerous behavior by the animal in question.