People don't have to tip on Rover, but they can if they're happy with the service. Owners can give a tip through the app, the website, or by handing cash to Rover sitter. The tip amount is up to them, and the app allows 10%, 15%, 20%, and custom tips up to 30%. Some people tip 10% to 20% of the total booking cost. All the tips go to the pet sitter.