Common sense. If you own an attack dog and don't have a legitimate need for it, keep it caged so innocent people and children don't get hurt. Otherwise take out a big insurance policy.
An attack dog is like a gun, if you keep it under lock and key you can never get to it in time if you need it.If the neighbor had a gun on the coffee table and the visitor picked it up and started fondeling it and it went off and wounded her would it be the guns fault?