The Karelian Bobtail is a medium-sized cat with a sturdy, muscular body and a short tail that typically measures 4–13 cm. The tail can be curved, curled, or straight. Its coat may be short or semi-long, with a dense undercoat that makes it resistant to cold and moisture. The coat colors vary widely—from solid to spotted, striped, and marbled patterns. The eyes are large and expressive, with colors that harmonize with the coat.