Dog bites are especially devastating to children because they are smaller and their faces are within easy reach of the animal's mouth. The likelihood of a child getting bitten in their lifetime is around 50 percent with 80 percent of those bites involving the head and neck.
--Science Daily Nov 12, 2010
If a complete stranger walked up to you and asked, "May I drive your car?" or "May I live in your house?" or "May I have your purse", your response is probably going to be "NO!" Now imagine if the reply to your response is "Why?"