Cats knead by pressing their paws alternately against soft surfaces like blankets or their owners. This behavior starts in kittenhood, as they knead their mother’s belly to stimulate milk flow. In adulthood, kneading is a sign of comfort, happiness, and relaxation. It can also be a way for cats to mark their territory using scent glands in their paws. Some cats knead before sleeping to create a cozy spot. While it’s a natural behavior, trimming their nails can help prevent discomfort if they knead on you.