@Lisa400 I think that Airbnb just doesn't want anything to do with pets. Pets are specifically excluded from their host guarantee, for example. This change has been requested hundreds of times on this forum - probably thousands - as well as in every host listening event I've ever attended, and here we are still without it. I don't think there's any other explanation. If they acknowledged that pets were being brought by guests, maybe they'd have to start paying out when there were damages.
I think that the ultimate cruel trick that they play with this is making hosts take people's support animals - not service animals, but support animals that aren't protected by law in many places - under threat of being delisted for discrimination, and then not paying out for those damages.
I also host a lot of pets, and I don't charge a fee specifically because they make it so cumbersome. I just roll it into the price.