How to handle day care for overnight stays?

Rover's charges are for 24 hour periods. From Friday morning to Sunday night, the client should be paying for two nights (two 24-hour periods) and a daycare charge that is at your discretion. Since the dog will be with you for an entire day, you would be fully justified in charging for another full nightly charge if it is over 12 hours IMO. On the customer's booking request, just edit the charges to add in the daycare fee you feel is appropriate from Sunday 9 am to whatever time she is planning to pick up her dog on Sunday night. All day Sunday is not free.

P.S. It is always good to get the dropoff and pickup times established before you accept a job, so that you can let the customer know about any additional charges for overages.

It sounds like you are not boarding at your home, you are doing visits. You said, " I usually include 3 daytime visits" If it's visits wouldn't you charge per visit?

If it's boarding at your home or their home think of it this way. You are charging for a 24 hour period once the 24 hour expires then charge a daycare fee or late fee, however you want to apply it. So for example, customer leaves Friday at 9am and picks up on Sunday at 9pm. The clock stopped at 9am for boarding now from 9am to 9pm is 12 hours you need to get paid for. You determine what you want to get paid. I hope that makes sense, it can get confusing at times but if you think of your care as a 24 hour period it should not be confusing.