Monthly Guest sneaks in dog without dissclosing if its a service pet

[Jory Wilder]

We don't allow pets in our airbnb as it is our first airbnb and rental property. We do this because we know pets come with odor and hair and we don't want to ruin our nice furniture. We have a monthly booking that just booked last minute, they had a bunch of questions before they booked but never mentioned anything about a dog. 

I know if the guests claim it's a service animal then I have to allow the pet, what is the best way to handle this situation. Also, is there some kind of scam for long term stays because this tenant seems fishy. The booking dates are 2-4-23 to 3-4-23 and if we can I would like to just refund the guests and get them out.