I am a "Double SuperHost" (2 homes listed.) It boggles my mind that AirBnB hasn't implemented a pet fee by now! It seems such an incredibly simple and obvious feature!
We are pet friendly, but pets often result in extra housekeeping duties (and expenses.)
Being able to charge say $10/night per pet, for example, seems to me to be a no brainer! If we can charge a cleaning fee, why not a pet fee? I haven't seen one word of a sensible explanation for AirBnB!
AirBnB's competitors (like VRBO) have offered this service for years!
Scores of AirBnB hosts have expressed their desire for this feature! Get with the program AirBnB!