Scottish Highland farmers and hunters relied on the Cairn Terrier to squeeze into rock piles, or cairns, and bolt foxes and vermin hiding inside. The result is a short-legged, sturdy working terrier with a broad, foxy head, small upright ears and a harsh, weather-resistant double coat in wheaten, red, gray, brindle or nearly black. Many brindles change color for years as they mature.
Cairns tend to be cheerful, curious and confident, friendly with most people yet independent enough to ignore a request they find dull. Expect digging, a strong urge to chase small animals and barking when bored. The breed is usually long-lived and hardy, with a low-shedding coat that stays neat with weekly brushing and periodic stripping. Like any breed, each Cairn varies in personality and energy.