@Karen2913 I don't know if this is related to what's happened to you, but I'll tell you my experience as a prospective guest.
You know, on the Splash page there's now a menu you can click on to activate a specialized Search, and one of the buttons is "Pet Friendly." It's represented by a picture of a dog laying on a bed, which @Sarah977 has pointed out is a really problematic way to show how hosts are expected to welcome pets.
I've been looking for a nice place to take my dog for the weekend, so I've clicked this tab despite its problematic elements. You know what happens? I get a page full of listings that are either
a) inactive and have no calendar dates in 2021 available, or
b) available but don't have "pets allowed" ticked off as an amenity
So while guest inattentiveness might be an influencing factor here, unfortunately Airbnb is deeply complicit in making it really hard for guests to process important information about the listings they're viewing. They just want to make the sale and take the money - you have to be super vigilant about making sure the booking fits, even if it means hitting Decline a few times and accepting the nastygrams the algorithm spews at you for that/