can i tip my walker?

Certainly. I am sure your walker would appreciate the gesture.

Yes, but unfortunately, Rover has only enabled "through the app" tipping like Uber does in certain markets. The rest of us are not so lucky, and keep asking Rover to please include this feature. If there is no option in the app, that means your walker is not in the markets that permit tipping through the app. To avoid exchanging off-platform contact info and avoid violating Rover terms, your best bet is to tip them in cash.