Cats are very interested in their owners' shoes because the shoes have the owner's scent on them, which makes the cats feel extremely at ease and close to them. Cats have a natural preference for small spaces because it provides them with a sense of security, and the owner's shoes provide just such a space.

Cats are very sensitive to smells, and their sense of smell is more than ten times that of humans. Their noses also have a special organ called Jacobson's organ, which can collect and interpret odor information.

Cats may also sleep or play on shoes. This is not just a way for them to express love to their owners. These shoes may smell like their owners and feel very safe for cats.