I have specific vaccination requirements. How do I add this to the profile so I don't have to tell every potential person
Unfortunately there is not an option to make it part of your "settings". But you can type it into your profile so that potential guests can read that information while looking for a sitter. In reality though, many pet parents do NOT read sitter profiles. So I imagine you'll have to continue to ask that of new requests. I've just come up with a great copy/past initial message that I use so that I don't have to type it out every time. Something like:
"Hi so and so. I read through Rover's profile and he seems like a great pup! I'd love to setup a meet and greet to determine if its a good fit and discuss his care in more detail. Just to confirm, I do require all guest dogs to be UTD on vaccines and spayed/neutered. Would you like to proceed with a meet and greet?"