Every year in France, dog bites result in several thousand visits to emergency rooms and numerous hospitalizations. An interdisciplinary epidemiological study involving epidemiologists, physicians, and veterinary behaviorists was conducted from May 1, 2009, to June 30, 2010. The study involved collecting medical information from the emergency departments of eight participating hospitals, supplemented by a telephone interview conducted by a veterinarian to obtain details about the circumstances of the bite, and a follow-up interview one month after the bite to assess the progression of the injuries. In children, bites were more common on the head and neck, but injuries were more severe in adults. Bites were more numerous and more severe when the victim knew the biting dog. No link was found between the severity of the bite and the type of biting dog. Among adults, bites often occurred when the victim attempted to separate fighting dogs, whereas among children, bites occurred when the dog was disturbed. Among those who completed the follow-up questionnaire one month after the bite, 39% reported sequelae, which were primarily cosmetic in nature (80%). Women and adults reported more sequelae than men and children. Prevention measures must be tailored to the findings of this survey. (R.A.)