Peterbald cats and Sphynx cats both differ greatly from their fellow felines. Despite sharing the hairlessness, the breeds do have a few differences. Peterbalds usually have longer heads, lower ears, and almond-shaped eyes. Sphynx have broken or no whiskers, while Peterbalds have a mustache. Peterbald cats have five coat layers and possess a dominant hair gene, while the Sphynx is entirely hairless and has a recessive gene.