Read what the door frame scratching is telling you
A Domestic Shorthair scratching door frames and carpets is maintaining her claws, stretching her back and leaving a scent-and-sight mark in a busy part of her territory. Door frames sit on the routes she patrols most, at doorways she passes a dozen times a day, which is exactly why they get chosen: scratching is partly a noticeboard, and nobody posts a notice where nobody walks. Carpets get scratched by cats who prefer horizontal surfaces, often where they also play or where a closed door blocks a route they want.
Look closely at her pattern before you buy anything. Does she scratch the frame of one particular door, usually the one that shuts her out of a bedroom or away from where people gather? Does the carpet damage cluster at thresholds? Vertical scratch marks at full stretch tell you she wants a tall upright post; long horizontal rakes in carpet say she wants a flat surface under her paws. The fix follows her preference, not yours.
Put the right scratcher in the wrong place's place
A Domestic Shorthair will switch targets when the legal option stands exactly where the illegal one does. Place a tall, heavy-based scratching post directly beside the scratched door frame — tall enough for her full stretched length, stable enough not to rock when she throws her weight into it, because one wobble teaches her the frame is the sturdier tool. For the carpet spot, lay a flat scratcher or a carpet-covered board over the exact patch she uses. Posts a room away from the damage might as well be in another house; cats scratch where the urge and the territory point them.
Make the new scratchers attractive and the old targets dull. Rub catnip or a treat scent into the post if she responds to it, scratch the post yourself in front of her to demonstrate the sound and motion, and cover the damaged frame temporarily with smooth tape or a fitted plastic guard so her claws slide instead of catching.
Reward the switch and never punish the scratch
A Domestic Shorthair learns the new arrangement through what pays off. Every time she uses the post or the flat scratcher, reward her immediately with praise, a stroke if she likes them, or a small treat, especially in the first fortnight. If you catch her starting on the frame, interrupt calmly with a call or a toy, lead her to the post and reward her for finishing there.
Trim her nails regularly if she tolerates it, a few at a time, because shorter tips do less damage while the training takes hold and need the post slightly less urgently. If she suddenly scratches far more than usual, damages herself, or the behaviour arrives alongside hiding or appetite change, a veterinarian should rule out pain or skin trouble driving it.
Hold the line as a household until the habit sets
A Domestic Shorthair's scratching habit changes only if everyone responds the same way for weeks. Agree the house rules: frame-scratching gets a calm redirect, post-scratching gets a reward, nobody laughs at the old behaviour or leaves the temporary covers off 'just for today'.
Expect the occasional test even after success, particularly when a door stays closed longer than usual or a new piece of furniture changes her routes. Treat a relapse as information about the setup, not defiance: add a post near the new hotspot rather than restarting punishment. Consistency across people is what makes this stick, and KinsLe Care Teams lets your household assign the daily redirect-and-reward watch for the Domestic Shorthair to named members, with each training check marked done by time.