Why does my cat sit in boxes?

Put an empty cardboard box on the floor and there's a good chance a cat will be sitting in it within the hour, even a box that's clearly too small, leaving the cat squished and overflowing. The internet has turned "if it fits, I sits" into a joke, but the pull toward boxes has a real behavioral basis.

The leading explanation is that enclosed spaces provide comforting tactile pressure along a cat's flanks, a bit like swaddling does for a baby. That gentle contact on multiple sides appears to lower stress and raise a cat's sense of safety. Boxes also offer a place to hide while still observing, which suits an animal that's both hunter and hunted, it can watch the room without feeling exposed. Tellingly, cats will even settle into a square simply taped out on the floor, which suggests it's the sense of a defined boundary, not the cardboard itself, that does the work.

There's a useful insight buried in this for stressful moments. In one shelter study, cats given hiding boxes had measurably lower stress than cats without them, and they tended to settle into new surroundings faster. So the box love isn't just a quirk, it reflects how much cats rely on small, enclosed safe zones to feel okay.

You can put that to work. Whenever your cat faces something stressful, a house move, a vet trip, visitors, having a familiar box or covered bed available gives it a fast, reliable way to self-soothe. If your cat starts hiding far more than usual and stops coming out for food or company, that's a different signal worth a vet check, but the everyday box habit is healthy and worth catering to.