I, too, would appreciate a pet-fee-button. Although most of the pets that come through cause minimal extra cleaning, there are the exceptions that require quite a bit of extra time. As a pet owner, myself, who likes to bring the dogs along, it irritates me when hosts/hotels charge an arm and a leg for a pet fee. Something like $10 per night per pet, seems reasonable. I've never had to spend more than an hour cleaning up after pets, and that was after 2 shelties for 4 nights whose owner didn't use the doggie sheet provided.
So, yes, thumbs for the implementation of the pet fee button 🙂