I’m not afraid of a slippery slope, I’m dug in ;).
IMO declawing is in the category of “not ideal, but better than abandoning/killing the pet involved”. I personally don’t do it, because I’ve never had a pet so destructive I needed to. It would have been overkill.
Neither of my cats are declawed. I have had some damage to furniture. Then again, I don’t buy the “couch gotta last 20 years” thing either. I think a 5-year replacement cycle is reasonable. As long as the damage is slight enough that my furniture merely looks “lived in” at the end of this period, then the cats and I can coexist happily.
There are a few things that most individuals can’t live with in a pet (or roomate for that matter :)). Like incontinence. We had that situation with a young, healthy stray my parents took in when I was in high school. She was just as happy to crap under the dresser as she was to crap in the (spotless) litterbox. Only someone who’s pathologically apathetic about filth could tolerate this. I couldn’t live with a roomate who kept casually crapping on the floor either.
Occasionally clawing to furniture, blinds, carpets wood, etc can be that extreme. I have a cat who literally has left grooves in part of a door jamb from scratching. It’s like having a miniature grizzly, marking his territory. In this case, I didn’t care. it was crappy student slum apartment, and the main reason he thought it was such a great scratching post was because it was already so banged up and nail-holed he could get a good grip. He’s left the woodwork in my current apartment alone. He doesn’t scratch smooth surfaces. So I never had to get him declawed, even when I got some “good stuff”.
Seriously, why don’t you try your cat with the new sofa before declawing? You can make a vet appointment anytime. Some cats will completely avoid new furniture for a while. (I had a cat that wouldn’t sleep on my new couch for a month. It was scary.) Some cats only scratch certain surfaces, your cat may not find leather appealing to the claws.
Cats don’t seem to like smooth surfaces to claw, which is why one spot get a real going over. Once it’s all snagged, it’s their new favorite spot. In my experience, new furniture is not particularly attractive to cats because of this, as long as you have a scratching post or even an old chair that you let them use.
My point is, it’s a continuum.
I don’t think you should declaw your cats because of concern about future scratching, or because of a few snagged threads on a 25 year old couch. At that point, I think the cat’s enjoyment in his bad-ass clawed nature should be considered against the actual cost/incovenience of keeping him off the furniture. As previous posters have noted most cats can be trained against scratching.
declawing may be the only solution for very destructive cats, and they’re likely to end up dead if their owners don’t declaw.
And Beelzebubba I agree with KellyM that spaying is not comparable. Spaying actually benefits cats more than humans. Strays are the biggest vectors for Feline Leukemia and FIP which are extremely contagious and have no cure. In this area, unvacinated strays usual have feline leukemia, and die within a few year of injury, disease, or simply getting run down in the winter and being unable to keep themselves fed. Meanwhile infecting any unvaccinated pets that they may tangle with as well. IMO supporting spaying pets for birth control is fully compatible with the idea that animals have a right to not be casually injured, maimed or killed.