cat has thumbs

 Some Polydactyl Cats Have “Mittens”

“Mitten paws” occur when a polydactyl cat's extra toes form in the middle of the paw, giving it a thumb-like—or mitten-like—appearance. Although these extra digits resemble thumbs, they aren't opposable.

Cats with extra toes have them because of a genetic mutation that often results in a dominant gene being shared down a family tree. If one parent is polydactyl, odds are good that at least some of their children will also be polydactyl.