noun
claw sharpening
The act of a cat sharpening its claws, often on furniture or a scratching post.
猫がソファで爪とぎをしている。
The cat is sharpening its claws on the sofa.
noun
scratching post; claw sharpener
A product or object designed for cats to scratch and sharpen their claws on.
新しい爪とぎを買ってきた。
I bought a new scratching post.
Compound of 爪 (つめ, 'claw') and 研ぎ (とぎ, 'sharpening'), the continuative form of 研ぐ (とぐ, 'to sharpen').