Possible Clues:

• Midnight, maybe
• Not many will follow dog when one’s told to stay in
• House rule, of a sort
• Regulation requiring people to be indoors during certain hours
• Time to go home
• Teenager's time limit
• Scoundrel is a handful and isn't the outgoing type
• Regulation requiring people to stay indoors
• Mongrel has hardly any prohibition on going abroad
• Not many supporting rogue measure restricting people's movements