Read the rescue sites, loads of dogs have a complete history as many are put forward where people become ill, have to move or change their working patterns or split up and cannot care for their dogs anymore.
To be fair no dog should be trusted fully with kids, I love and have trusted all my...
Very much this, but get a rescue lots of great people out there can help you get the right dog for you and your family
A good starts here
http://www.sussexpetrescue.org.uk/new_dogs_for_adoption.htm
or here...