Why do cats scratch up couches?

Scratching is partly a territorial behavior. Cats have scent glands on their paws, so, when they scratch something, they are marking it as their own in two ways: first, by physically damaging it, and second, by applying their scent to it.

Scratching is also a grooming behavior. It helps remove the outer layer of dead tissue on their claws.

It is also a way for them to stretch, as well as a form of exercise that strengthens and tones their upper body.

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