The Norfolk Terrier has a life expectancy of 12–16 years. Both males and females typically weigh 5–6 kg and stand 23–25 cm tall. They are adapted to cold weather but should avoid prolonged exposure to extreme heat. This breed has a high energy level and a double coat with a hard outer layer and a soft inner layer, with colors including red, wheaten, black-and-tan, or grizzle. Hereditary diseases to note include dental and respiratory problems.