The cost per guest over 2 didnt work for me. People always said 1-2 and brought 4-5. We allow max 4. Now I just charge the same price for 1-4 people. Try raising your base price.
I think if the place holds 12 and someone says 1, that’s a red flag. I would ask them to confirm the number of guests and remind them of the outdoor cameras, and the fact you have to be accountable to your neighbors, HOA, and short term rental license if all are applicable.
as far as the dogs, do you not allow? Or didn’t they not disclose and not pay a pet fee?
if you have outdoor cameras, show Airbnb the videos and take pictures of the excessive cleaning and damage.