I would say talk to them personally on arrival and don't assume any knowledge of what you or your animals need. Some guests will have, or have had, experience with pets or farms or other livestock, many won't know any more than they see on TV, if that. So be polite, clear, helpful and explain what is safe for them and their kids, frame it positively and offer them a scheduled opportunity to walk around with you on a guided tour, or pet the ... whatever you can offer, and don't leave it to them to work out what they can do cos they will inevitably guess and likely get it wrong. If you're lucky you will find some repeat business and those folk will know, can perhaps have more leeway, feeling special in the process. But starting out remember you are offering them a lovely place to stay and they're paying for a good holiday base, not a list of rules and regs and stayout signs that make them feel unwelcome, but not a dangerous jungle of unknown minefields like animals and your expectations
Imagine you're inviting an in-law or the boss and his wife and want to make a good impression without coming over too pally or too pushy, that's usually a good place to start with guests