House Sitter shift transfer?

You need to contact Rover Customer Support. If I were a client, I would not want the sitter making arrangements on his own for someone I had not met to stay in my home.

Karen is right. It would be a potential liability issue in the case of emergency. The client took the time to book with you, and if your ability to commit to the stay has changed, it will likely need to be cancelled so that a sitter can take over. The client will receive a 100% refund for the days that you were not available, and a new sitter will take over the booking from there. If the owner is truly unavailable, and the reason for going out of town is an emergency, Rover Support would be able to help you find a suitable replacement. There is also the chance that Rover will suspend or deactivate your profile when you cancel on a client.