The question of whether or not a Sphynx is a Siamese can be confusing, given the two breeds’ similarities. Both the Sphynx and the Siamese cats are characterized by their slender bodies, their large ears, and their blue eyes. They also both have a fairly distinct vocalization pattern. The answer is, a Sphynx is not a Siamese. Though the breeds share many physical features, a Sphynx is its own distinct breed, with its own unique history and characteristics.