The owner said she had no idea her dog was out or that it had bit someone, police said.

http://www.mlive.com/news/muskegon/index.ssf/2012/04/second_pit_bull_in_two_weeks_s.html

You need to know where your dog is at all times. If you can't handle that level of responsibility, as evidence in so many pit owners, then get a pet rock to leave in the back yard.