The Cairn Terrier is a small, sturdy breed known for its spirited personality and shaggy coat. Originating from Scotland, these dogs were bred for hunting small prey such as rats and vermin. Cairns are characterized by their alert expression, erect ears, and bushy eyebrows, giving them a cheerful and intelligent appearance. They typically weigh around 13 to 15 pounds and stand 9 to 10 inches tall at the shoulder.