Parceling out your pricing is way too complicated. Scooping litter boxes and picking up dog poop is basic daily care, just as cleaning stalls would be for horses. My petsitter and everyone else that I know, includes bringing in mail. I don't ask my sitter to water plants, but many I've talked to include that. I think you are best served by picking a basic price per day. Figure out about how much time it will take to do most things, and how much you want to make per hour. Add milage to that if it outside a predetermined area. Maybe have one price for homes that only have household pets like dogs or cats, and an additional charge for farm animals. After you've done it for a few times, you can adjust your price if you find it is not worth your while.Some petsitter charge per visit, if someone just wants once a day, to check on animals and refill dishes, that can be less than 2 or 3 visits. Prices will vary depending on area, it's pricy here, so I pay my sitter $60 a day, that's for overnight, for 2 dogs, a cat, two cages of doves and the chickens. Bunnies too, back when I had them. One thing that jumps out at me, if people have chickens that need to be let out, how early are you planning to be there? Can you be there at dusk to safely lock them up, without leaving your flock hanging around in the dark? Same if cows need to be milked, dogs need to go potty, etc. Seems like you will have to drive some, to get to your clients, so that makes it a pretty early start to the day. That's why I have someone who will overnight, so my dogs are not crossing their legs until someone arrives in the am.