What's the best way to set up a dog walking schedule for example every Tuesday and Thursday and when do I get paid?

Yes, and each of those clients is different. What works well for one may not for another, I'd suggest you could set it up weekly with a total for 2 walks and include the dates the walks are for in the message. (something like this is for Rover's walks on this Tuesday date & Thursday date. Looking forward to it.) That way the customer's card gets pinged just once per week upon booking, you get paid about 3 days after the second walk of each week, and if the client's needs change, you won't have to adjust much. Re-booking future weeks visits is pretty easy. From dashboard, past customers, you can again set up a quote with message re. services.