What to Charge/ Do When Client Expects Midday Drop-In Free With Overnight Stays?

What do you guys do when you have a client expect a midday drop in for free when they book an overnight with you? What times do you consider the overnight to encompass? I have had clients expect me to stay at their location for the full 24 hours, but I have my own dogs and job that I need to leave their house to attend to? Also, I typically tell them that the overnight is from 9 pm- 7 am with me and they are like well our animal needs to be let out in the middle of the day. How can you tell them well thats considered an additional drop-in so that rate will apply?