I would like to add dog-walking to my profile?

I've offered both dog walking and daycare. While there isn't a place to set up a daycare rate in your services list, you can certainly use the nightly rate for daycare. Just adjust the dates to cover the days when you'll be providing daycare (if they're all in a row, you can put them on the same booking - if there's a gap between days, you'll have to process them as separate requests because it will calculate the fee based on the total number of days in the requested date range). Then just manually adjust your nightly fee to your daycare rate for this booking.

For walks, you can set a rate per walk under your boarding info. If someone just wants to book you for daily walks, make the booking to cover the days when you'll be providing walks, set your nightly rate to 0 for this request, and add the number of walks you will be providing - then it will calculate the total based on the number of walks and the cost per walk you've set in your profile.