"Leather" furniture sold in most stores isn't a true Leather piece. The Leather is only on the parts that are used. Such as the seat cushions (top and bottom) the arms, the front band and the inside back of the furniture. The rest is usually Naugahyde (vinyl to look like leather).
When I owned by Upholstery company, I was hired to custom make two white all leather sofas. One for the customers and the other for their "Cat". Back then leather hides were around $400 each and a typical sofa takes about 12 hides.
Unless you have tons of scratching posts around, leather and cats don't mix.