Some cats look like they have “thumbs” because they are polydactyl: a harmless genetic quirk that gives them extra toes, usually on the inner side of the front paws where a thumb would be.

What these “thumbs” really are

  • The “thumb” is actually an extra toe that grows on the inside edge of the paw, so the foot can look like a little mitten.
  • Vets call this condition polydactyly, which simply means “many digits” and can affect front paws, back paws, or all four.

Why some cats are polydactyl

  • Polydactyly is caused by a genetic mutation in the genes that control digit development during embryo growth.
  • It is an autosomal dominant trait, so a kitten only needs one parent with the gene to have a decent chance of being born with extra toes.

Is it useful or harmful?

  • Most polydactyl cats live completely normal lives; the extra toes usually work just like regular ones and often do not cause pain or mobility issues.
  • Some caregivers feel their polydactyl cats have slightly better balance or grip, but evidence is mostly anecdotal, so regular vet checks are still important to catch nail or pad problems early.

Are they rare or special?

  • Polydactyl cats are not considered rare; when one polydactyl cat breeds with a non‑polydactyl, about half of the kittens may inherit the trait.
  • They have picked up nicknames like “thumb cats,” “mitten cats,” or “Hemingway cats” because a famous colony of them lives at Ernest Hemingway’s former home.

Do cats really have opposable thumbs?

  • Even when the extra toe looks very thumb‑like, it is not truly opposable, so cats cannot use it like a human thumb to pinch or hold objects in a precise way.
  • What people see as “thumbs” is just one more flexible digit on an already very agile paw, which still relies on claws, pads, and wrist rotation rather than a true thumb joint.

Information gathered from public forums or data available on the internet and portrayed here.