How many claws do most cats have on each of their back paws?

While almost every cat has five claws on the front paws and four on the rear ones, some cats have genetic mutations that give them an extra claw per foot. These cats are known as polydactyl cats. Any type of cat can be a polydactyl, but it’s a relatively rare trait because the gene is recessive. Today, most polydactyl cats are intentionally made that way by breeding two polydactyl cats together.

Source: Hepper