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I want to buy a new sofa for our living room. After I buy it, I'm 100% sure my cats will also want to sit in the new sofa and sharpen their nails in the new sofa and ruin the new sofa. I've talked to them about the issue, but they seem to ignore me.

I guess my question is: What type of sofa should I buy to minimize this? Or what can I do so that they stay away from the sofa? IS there a specific material that cats particularly dislike?

The living room doesn't have a door, so closing the area off is not an option. I also prefer not having to spray the sofa.

You're unlikely to be able to make the sofa inhospitable to the cats without also making it inhospitable to yourself, but there's steps you can take to minimize the damage they'll do.

Ensure they have sufficient approved scratching surfaces; if they don't have many yet, add more before you get the sofa, so they get used to them and their locations, and are less likely to go looking for additional surfaces.

Discourage scratching on target surfaces (typically the corners, back if accessible, and sometimes the top of the sofa) with materials they don't like. These include double-sided tape (often sold under the name "Sticky Paws"), aluminum foil, and heavy plastic sheeting (similar to what's used for office chair mats). Depending on how clever your cats are, the clear materials are better, because they won't be able to easily see if and when they're removed.

Additionally discourage targeting those areas by putting a scratching post nearby. You may also need to redirect them if you catch them scratching at an unprotected part of the sofa. By having the appropriate target close to the inappropriate one, it's much easier to redirect their attention.

If there's a corner they just won't stay away from, consider a long-term solution. It may not look as nice as the untouched sofa, but it'll certainly look better than a shredded one. Look into plastic corner protectors as a way to discourage interaction, or try a sisal scratching mat (like the LURVIG mat sold by Ikea) attached to that area for a durable, appropriate scratch spot.

And if all else fails, find a way to embrace concealing the damage; there are many examples of how to use lace, fabric, or other techniques to disguise damaged corners and surfaces on a sofa that can look quite nice when finished, and add some unique personality to your furniture.

The best solution to your problem is to get a good scratching post for your cats.

If you get a scratching post your cats like they will not use your sofa at all to sharpen their claws.

A god scratching post needs to be heavy so your cat are not able to move it this means it must weigh 15-20 kilo or more,The scratching surface must be made of sisal or hemp rope so your cat can use its full strenght when scratching.

One single catclaw can hold the cats weight so they are strong.

For your cats sitting in the sofa you can use a folded towel for them to lay/sit on.