Good question.
The pet fee is somewhere between $75-$100. Please be aware that this fee applies for the entire booking regardless of the number of pets. Therefore, I do not accept guests with more than one pet because the system does not account for the second pet.
Regarding late check-out, if I don't have another guest checking in the same day, and it doesn't interfere with my cleaning schedule, I offer them a free late check-out until 15:00. Anyway, I won't have a guest checking in that day, and it will mean a lot to them. I prefer to be generous and have good reviews rather than collect the $10 and have an unsatisfied customer. Also, collecting the $10 can be problematic.
If I can give you one tip, it is never to leave the chat within the Airbnb system and never accept any form of payment outside the Airbnb system. This is where many of the troubles begin.