A dog attack can happen to any person at any time and for any
reason. Just because an animal is domesticated doesn't mean that
they aren't capable of attacking another animal, or more
importantly, a person.
A very important thing to remember about dogs in general is that
ALL DOGS CAN ATTACK! Even the tiny breeds can be killers.
It may seem silly, but it is quite true.
Case in point, in October of 2000 a news-story reported that a
family's pet Pomeranian had mauled their 6 week old baby. As a
result, the baby died shortly thereafter. ("Baby Girl Killed by Family Dog,"
Los Angeles Times, Monday, October 9, 2000, Home Edition, Metro Section,
Page B-5.)
So if you are living under the assumption that just larger dogs can
inflict fatal wounds, you had better start re-thinking!