Sphynx are medium sized substantial cats and not fragile in any way. As with most cats, adult males are larger than females. Sphynx have sturdy boning, good muscle development and a bit of a firm belly as if they just finished a nice dinner. They have an open-eyed and intelligent expression with extra wrinkling on their head which some see as a worried or inquisitive look. Sphynx are extremely lovable, known to perform silly antics and can be downright clumsy in their attempts to be the center of attention. They have abundant energy and are mischievous, always wanting to be with you, on you or showing off for you. Sphynx seem to prefer human attention but enjoy the company of dogs and all other breeds of cats.