8. Cairn Terrier
Hailing from the Scottish Highlands, Cairn Terriers were developed to clear stone cairns of hidden pests and predators. Weighing 13 to 14 pounds, these rugged little dogs possess a fearless attitude and an relentless work ethic.
Cairn Terriers remain highly attuned to movement around their yard or home perimeter. Their vocalization is quick, clear, and persistent. When paired with consistent boundary training, a Cairn Terrier serves as an energetic and dependable household lookout.
