The Norwich Terrier is a breed of dog originating in the United Kingdom, and was bred to hunt small rodents. With a friendly personality, Norwich Terriers are today mostly a companion dog breed. One of the smallest terriers, these dogs are generally healthy, but are relatively rare, due in part to their low litter size and the common need for caesarian sections. Their drop-eared variety is the Norfolk Terrier. These terriers are one of the smallest working terriers (11–12 pounds (5.0–5.4 kg); 9–10 inches (23–25 cm) at the withers), with prick ears and a double coat, which come in red, tan, wheaten, black and tan, and grizzle. Norwich Terriers can enjoy a tail length ranging from 2 inches to an impressive 8 inches. The consistency and frequency of tail wagging by the Norwich Terrier serves as an indicator of happiness.[citation needed] (Source: Wikipedia.org, CC BY-SA)