The Yorkshire Terrier is one of the smallest dog breed of terrier type, and of any dog breed. The breed developed during the 19th century in Yorkshire, England. Ideally its maximum size is 7 pounds (3.2 kg). It has a grey, black and tan coat, and the breed's nickname is Yorkie. The Yorkshire Terrier (also called the 'Yorkie') originated in Yorkshire, a county in northern England (and the adjoining Lancashire). In the mid-19th century, workers from Scotland came to Yorkshire in search of work and brought with them several different varieties of small terriers. It may take three or more years for the coat to reach its final colour.