I have a semi feral cat who absolutely refuses to let us to trim her claws. She is polydactyl and HAS to have her claws trimmed because one of the extra claws curls into her "palm". We take her to the vet for a pedicure once a month or so. For some reason she'll tolerate having a stranger do it. It's twelve bucks, but that's a lot cheaper than antibiotics for us after she bites us. In your case, it might be cheaper than a new leather sofa.