My parent's cat is always sharpening its 'nubs' on random cardboard boxes as well. It has been declawed since it was about 6 months old, but 15 years later, the cat still religiously tries to sharpen its non-existent claws.
Mentally, a declawed cat seems to act much the same as a non-declawed cat. What would be interesting though to find out is, what happens to cats if they are born without ever having claws? Is it still their natural instinct to try to sharpen and/or use their claws, even though the don't, and never have existed?
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