How big the Sphynx usually is? How do they look like? At first sight the Sphynx cat or Sphynx kitten might look like a child’s experiment with a bottle of Nair, but the fact is Sphynx kittens are just born that way. This is a substantial cat, medium sized and strong, with adult males being larger than adult females. Sphynx have sturdy boning and good muscle development and should have a bit of a belly as if they just finished dinner. They have an open-eyed, intelligent face and a friendly expression. Some people are fond of Sphynx cats, some don't like them or, it seems to be true, just don't understand them.