I recently had a incident where my dog was put into quarantine for scratching a little boy that was hitting my son.  Of course my dog was just doing what he was suppose to do which is protect his humans. However we had to take him to the animal control office, that way the charges would be cheaper, and he went willingly into the pen they had set up for him.  Then I noticed that in addition to the latch on the door they also had locks on each pen. I guess just in case someone came to break him out then he would not be able to get out.  Hope we can get him back soon.