There are approximately 1 million dog bites each year in the United States. Between 60 and 70% of them are to children. (See this.) That's a pretty staggering statistic.
Why are a majority of bites to children? In 2007, three researchers attempted to address that question. They examined the records from three years of bite cases involving children from the Behavior Clinic of the Matthew J Ryan Veterinary Hospital of the University of Pennsylvania. They looked at 111 cases. (There were actually 145 cases, but they could not determine the age of the children in 34 of them so they were not included.) A few of the cases were repeat offenders; there were only 103 unique dogs in the study.
每年在美国，被狗咬伤者达100万，儿童占60至70％。 参见:
http://cat.inist.fr/?aModele=afficheN&cpsidt=3917495，这是一个相当惊人的统计。
为什么咬伤的儿童占大多数？ 2007年，三组研究人员试图解决这一问题：
http://injuryprevention.bmj.com/content/13/5/348.abstract
http://www.dogstardaily.com/blogs/why-do-dogs-bite-children 
