The dog breed with the longest ears is the Basset Hound. Basset Hounds are known for their long, droopy ears that hang down close to the ground. Their ears are typically low-set, velvety, and can reach impressive lengths. In addition to their adorable appearance, the long ears of Basset Hounds serve a purpose as well. They help direct scents toward the dog's nose, which aids in their exceptional sense of smell, as Basset Hounds are scent hounds originally bred for tracking game.