What do I do when my sitter doesn't show up?

In situations like this, you should call Rover Customer Support at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team]. They will endeavor to find you a replacement.

And if this service was booked on Rover.com, please write a review so other pet parents are aware.