@Emilia42 I get that, but I often search without putting in dates/guests. I'm an avid Airbnb user, and I didn't figure it out right away. This question came up in my neighborhood FB group and multiple people commented that Airbnb no longer had a "filter" to search for pet-friendly rentals so they had abandoned it and gone to Bringfido.com and other booking services. I can't imagine what a first-time user would think.
It stands to reason you can't account for all things people might do, but it seems a pet "filter" is a common way to search for pet-friendly rentals so you'd think they'd keep the filter in addition to filtering when you input the number of guests/pets.