Why does my cat really need a scratcher, and how often should I replace it?

Quick answer

Scratching is an essential behavior that helps cats maintain their claws (shedding the outer sheath), relieve stress, and mark territory through scent glands in their paws (a territorial-animal instinct). Without a scratcher, they'll turn to furniture or wallpaper instead. Replace it once it sheds excessive paper dust or the surface has worn down and lost its function (usually every 3–6 months).