Cons to having your cat declawed
First of all, this is a painful operation. Cats might not display much pain because of their natural instinct to appear strong and invulnerable. The procedure is so traumatic to some cats that they undergo a personality change. They might become more fearful, realizing their first line of defense is gone. They might also begin to bite, since they can no longer scratch.
Some declawed cats will stop using the litter box, and since they can no longer mark their territory by scratching, they might revert to copious spraying. Declawing sometimes changes the way a cat walks, which could eventually lead to arthritis. Owning a declawed cat is a real commitment to always being diligent to keep it indoors, away from dogs, aggressive felines and other predators.
-Cats.com