Hokay, cats will scratch cars if they decide to stretch after
waking up while on the car...
When they stretch, the claw will extend out involunteeringly...
unless the cat has been de-clawed...
Same thing for cats sleeping on the leather seats of
motorbikes...
Their claws are made from the same material as our nails, and
despite their shape, they won't scratch car paint easily.
By the way scratches weren't involved. This was the photo.
