Why do cats knead blankets?

Kneading—often called "making biscuits"—is a common and deeply ingrained behavior in cats. There isn't just one reason for it; rather, it’s a mix of biological instincts and comfort-seeking behavior.

• Infantile Instinct: This is the most widely accepted theory. When kittens are nursing, they knead their mother’s abdomen to stimulate milk flow. Even after they are weaned and grow into adults, this rhythmic motion remains associated with that early sense of security, warmth, and nourishment.
• Marking Territory: Cats have scent glands in the soft pads of their paws. When they knead a blanket, they are leaving their unique scent behind. By "marking" their favorite sleeping spot, they are effectively claiming it as their own and creating a space that smells safe and familiar to them.
• Creating a Bed: Before domestication, wild cats would flatten tall grass or piles of leaves to create a soft, safe, and hidden area for resting or giving birth. Kneading a blanket is a domesticated version of this ancestral behavior—they are essentially "fluffing the pillow" to make the surface more comfortable and suitable for a nap.
• Emotional Regulation: For many adult cats, kneading is a self-soothing activity. It is often accompanied by purring and a half-lidded, relaxed gaze. It signals that the cat feels safe, relaxed, and content in their environment.

In short, when your cat kneads a blanket, they are tapping into a deeply embedded instinct that tells them they are in a safe place, while simultaneously claiming that spot as their own personal sanctuary.