Here’s a sneaky reason: marking territory. Cats have scent glands on their paws, cheeks, and tails. When they roll, they’re smearing their own personal signature all over that litter.
It’s a double-move: “I’m putting my scent on you, and I’m taking your scent with me.” It’s a way of saying, “This box is mine, and now you smell like it too.” Pretty clever, huh?
It’s like leaving a note that says, “Occupied by a Very Important Cat.”
Why Is My Cat Rolling In His Litter Box at Elisa Champagne blog