Are these good responses to sitting inquiries?

I'd suggest that you discuss all the fees during the meet & greet and afterwards using Rover messages. Some sitters also add fees to their profile (as well as promotions such as Free Dog Wash for all April bookings!), so a potential client can see before contacting. It's fine to ask about ailments and preferences, which you could get more specific about, though you'd likely want to ask more detailed questions during the meet&greet. To make it a little easier to read, I'd cut "you are able to" (instead the "The earliest drop off is...") I'd absolutely require the dog owners to provide harness&leash that fits their dog and provide the food their dog is currently eating to prevent issues. Then, those last two items don't need to be mentioned or it could be simply Please note your dog must come with collar, ID tags, harness, leash, and food.

For the L.A. area, all of your rates look extremely Low (including boarding stay for $22 and daycare for $15 as well as the extended fees for late pick-up), especially since you're only caring for a couple dogs at a time. Instead of listing next day pick-up as a separate fee, you could just let them know before booking that if they can't pick up by 7:30/9:30 depending on service, an additional day fee will be added to allow them to pick up the next day.