@Alex9644 Whenever a guest books and the pet fee is not selected, I send a detailed message that clearly states that they are booked for arrival on [date], departing on [date], X number of guests and NO PETS. This generally results in the guest letting me know that they are bringing Fido, and then I charge the pet fee via the Resolution Center.
Once they inform me that they are bringing a pet, I send them my Pet Addendum which states my expectations as to picking up after the pet, etc. I ask them to verify that they have read the addendum and agree to the terms. Usually the pet owner is more than happy to do this, EXCEPT when the guest decides that Fido is a service animal or ESA, in which case I send them the ESA Pet Addendum which is longer and even more detailed.
It would be so much better if AirBnB did not have the language on the website stating that service animals do not need to be declared at booking. That is BS. Owners have the right to know that the guest is bringing an animal.