Histories of animal bites are usually volunteered, but the history of a human bite, such as one obtained over the knuckle during a fight, is more likely to be denied or explained only after direct questioning. Dog bites make up about 60% to 80% of all bite injuries, followed by cats (20–30%). Urban medical centers may see human bites more frequently (up to 20%). In the United States the annual incidence of animal bites is 1 to 2 million per year (200/100,000 people per year).

 

Bites may cause injuries from abrasions, to lacerations, puncture wounds, soft tissue crush injuries, fractures and tendon injuries, and amputations. Patients either will present with a fresh wound soon after the injury or will delay and only seek help after developing painful signs of infection.