Glen of Imaal Terrier Blue My Faithful Friend Mugs - Decorated in the USA These gorgeous mugs have a wonderful painting by renowned artist Tamara Burnett on one side and show three predominant traits of the breed on the other side. These mugs hold 15 ounces of your favorite beverage, are made of earthenware and are top-rack dishwasher safe and microwaveable. They are printed in the U.S.A.