Scratching is a cat's natural instinct, so stopping it is impossible. For kittens, their claws are their most powerful weapons, so they must be constantly worn down to remove dead skin and keep them sharp. Furthermore, the sweat glands on a cat's paws secrete a scent that remains when it scratches furniture or walls, much like dogs mark their territory with urine. Cats also need to establish their own territories in the home. However, if cats are allowed to scratch indiscriminately, sofas, curtains, chairs, doors, wooden floors, wallpaper, and other furniture will become severely damaged. Moreover, once a cat identifies a scratching spot, it will repeatedly return to that location, causing even greater damage. Therefore, responsible cat owners should begin training their cats to develop good scratching habits as early as possible, before the furniture is ruined. 
"Mafia Boss" type cat
Cats leave their scent by scratching to mark their territory and also to signal their presence to other cats. These familiar scents make a cat feel safe at home and also tell the other cats, "This is my territory! If you want to stay here, prepare your protection money!"
Cats with "congenital timidity"
Cats that feel insecure at home may scratch more. This insecurity could be caused by a new cat joining the household or changes in the home environment (moving, furniture being moved, or the purchase of new furniture, etc.).
"Habit becomes second nature" type of cat
Many cats like to scratch wallpaper, probably because they enjoy the feeling of scratching it. For a cat, digging its claws into the wallpaper and watching small pieces fall down to become its toys is probably a very satisfying thing. The thicker the wallpaper, the more significant their "achievement"! Over time, scratching becomes a habit, and the "victims" end up all over the house.
"Family Guardian" type cat
Many cats consider themselves the owners of the house, so protecting their home becomes their inescapable responsibility. If a cat frequently scratches near the door, it may be indicating that it believes potential "intruders" will enter through there.
How to prevent your cat from scratching? PetCat.com believes that to stop your cat from becoming a furniture destroyer, you should teach it as early as possible how to choose the right place to scratch. First, prepare dedicated scratching tools, and prepare several of them, placing them in areas your cat likes to go.
If your cat starts scratching on the furniture, immediately say "no" and take it to a scratching post. You can hold its front paws and let it scratch. At first, the cat might fuss, but after a few times, it will patiently scratch. Praise it when it scratches skillfully; this way, the cat will naturally remember the scratching spot. If you can't wait, you can spray lemon water, eucalyptus oil, or other liquids with scents that cats dislike on the areas you don't want it to scratch. However, the effect diminishes once the scent disappears, so patient training is the most important thing.
