A cat self-groomer is a bristly or soft-spiked object you fix at cat height so your cat can rub its own face and cheeks against it. Does it work? For a cat that already rubs on furniture corners and door frames, yes, most take to it within a week. For a cat that does not do that, it will sit there looking cute and unused. It works with the cat's existing habit rather than teaching a new one.
What a self-groomer actually does
Cats rub their faces on things constantly. Partly it feels good on the cheeks and chin, and partly it is how they leave their scent on the edges of their territory, which is why they target corners. A self-groomer just gives them a purpose-built corner to do it against, one with soft spikes instead of a table leg. As they rub, it catches a little loose fur along the way.
Which cats use it
The cat who is already headbutting your furniture corners is the one who will love it. The signal is easy to read: if your cat rubs its cheeks on the sofa edge, the door frame, or your shins, it will use a groomer put in the same kind of spot. A cat that does not face-rub much is a harder sell, and honesty here saves you a return.
Where should you put it?
Somewhere your cat already walks past and already rubs, at about shoulder height so the cheeks meet it naturally. A wall or table corner they pass every day is ideal. Give it a week before deciding it has failed, since some cats need a few days to accept a new object in a familiar spot.
Does it replace brushing?
No, and it is worth being clear about that. A self-groomer is a self-serve cheek rub that happens to catch some loose fur. It is not a de-shedding tool and it will not do what a proper brush does. Think of it as enrichment the cat runs itself, not a grooming appliance.
Our version
The Nadenade Arch is a small soft hedgehog that sticks into a wall or table corner, with soft rubber spikes and a little cradle inside for catnip if your cat is the type. なでなで nadenade means petting, which is more or less what your cat is doing to itself against it.