Called the King of Terriers, the Airedale is the largest of the terriers. Mill and factory workers in Yorkshire's Aire Valley developed it in the mid-1800s from old black-and-tan terriers and the Otterhound. It hunted rats and otters, swam well, and later carried messages in World War I. Adults usually weigh 45 to 70 pounds and wear a hard, wiry black-and-tan coat and a bearded face.
Many Airedales are clever, confident and playful, with a stubborn streak. They bond closely with their families but bore easily, so they do best with varied training and daily jobs. The coat sheds little yet needs regular clipping or stripping, and a strong urge to chase small animals is common. In Phoenix, that chase drive matters on leashed walks and around desert wildlife.