The Border Terrier is a small and sturdy dog breed known for its affectionate nature, intelligence, and tenacity. These dogs typically weigh between 10 to 25 pounds and stand around 10 to 18 inches tall at the shoulder. Border Terriers have a wiry, weather-resistant coat that comes in various shades of red, grizzle and tan, blue and tan, or wheaten. They have a distinctively otter-like head with dark, expressive eyes and a keen, alert expression.