Pet Relief Areas at Airports

[Bogertophis]

Are pets flying that common? If so, why?

Not "common" but you can't have them de-plane & pee just anywhere. And most pets being flown somewhere may already have to "go" just by the time they get
to the airport, so again, this is very helpful. Similar to baby-changing stations in restrooms, & guess what guys...those are now being put in YOUR restrooms too.