Ancol Leather Timberwolf Dog Lead. The Ancol Leather Timberwolf Dog Lead combines finest quality leather and superb tailoring to give you a beautiful, durable accessory for your dog. Sewn with nylon-bonded industrial thread down both sides to provide added strength and treated with a leather protector (3M) to prevent staining (water, oil, dirt), the Timberwolf collar is available in 2 sizes.