Tortoiseshell describes a coat, not a breed. A tortie's fur mixes black-based and orange-based colors in patches or a fine mottled blend, usually with little or no white. Dilute torties look soft gray and cream, and torbies add tabby stripes. Because the orange gene sits on the X chromosome, nearly all torties are female.
Most torties adopters meet are domestic shorthairs, so size, shedding and health look like those of any medium-sized house cat: usually 6 to 14 pounds and 12 to 18 years of life. The "tortitude" reputation for sass is mostly owner folklore. A tortie's age, history and socialization say far more about her personality than her coat does. Shedding is moderate, so weekly brushing helps in a home where the air conditioning runs much of the year.