The Cairn Terrier comes from the Scottish Highlands and the Isle of Skye, where farmers and hunters relied on it to bolt foxes and vermin out of rock piles called cairns. That work shaped a short-legged, sturdy dog with a foxy face, small upright ears and a harsh, weather-resistant double coat in wheaten, red, gray, brindle or nearly black. Toto in The Wizard of Oz was a Cairn.
Cairns tend to be cheerful, confident and independent enough to ignore a request they find dull. Expect digging, a strong urge to chase small animals, and barking when bored. The low-shedding coat stays neat with weekly brushing and periodic hand-stripping. In Tampa, where yards, lakes and sidewalks all hold something to chase or dig, a secure fence and a leash matter more than a Cairn's size would suggest.