Why Do Cats Love Boxes?

Security, not comedy. Walls on three sides mean fewer directions to watch.
The stress data
Sleep is when an animal is most vulnerable. Shelter studies find that giving cats an enclosed hiding place measurably lowers stress — cats with boxes settle into a new environment faster than cats without.
Heat retention
An enclosed space traps the cat's own body heat. A box is warmer than the floor beside it for the same reason a tent is warmer than open ground.
Why the box is always too small
Compression against the walls is part of the appeal — contact on multiple sides is reassuring. "If I fits, I sits" is a description of that preference, not a joke about it.
Building a better box
The upgrade on a cardboard box is a soft-walled cave that holds its shape. Structure is the hard part: most fabric hides collapse flat, which removes the enclosure that made them appealing.
Cat Covey
A 60″ × 50″ throw with a gusseted pouch sewn into the foot end. Your feet go in at the mouth; the cat takes the nest. Micro Mink outside, Sherpa lining, and a semi-rigid entry seam so the pouch stays a cave instead of collapsing.
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