Cats evolved from wildcats, whose ancestors developed sharp claws to hunt small animals. Even modern cats like to catch mice and climb, and sometimes fight with other animals. Therefore, cats have very sharp claws. Because cat claws grow quickly, especially cats raised in city apartments that lack exercise and climbing opportunities, and seldom run on rough surfaces, their claws are not worn down and grow faster. If cat claws grow too long, they will curl inward, and the hooked tips may affect walking and injure the paw pads. To keep their claws sharp and prevent them from becoming too long and curling, cats develop the habit of sharpening their claws.

　　Cat claw sharpening is actually a physiological necessity, not an abnormal behavior. For pet cats, it is necessary to meet this need by providing a wooden post or board for claw sharpening. Generally, cats prefer cedar wood, which is moderately soft and hard, or you can buy cat scratch boards specially made for cats at pet stores. With these claw sharpening tools, cats will not scratch furniture around the house randomly.