The Kerry Blue Terrier is a breed of dog that originated in Ireland in the 18th century. The breed was developed for hunting small game, as well as for herding and guarding livestock. They are medium-sized dogs, weighing between 33 and 40 pounds, with a distinctive blue-gray coat that can range in shade from light to dark. Famous owners of Kerry Blue Terriers include U.S. president Ronald Reagan, who had a Kerry Blue Terrier named Lucky, and actress Grace Kelly, who owned a Kerry Blue Terrier named Tara. The breed has also been recognized by various kennel clubs, including the American Kennel Club and the United Kennel Club. They are popular in dog shows and have also been used in various dog sports, including obedience, agility, and tracking. Kerry Blue Terriers are known for their loyal, intelligent, and energetic personalities. They make great family pets, but they require regular exercise and mental stimulation to keep them happy and healthy. They are also known for their strong-willed and independent nature, which can make them a challenge to train. However, with consistent and patient training, they can become well-behaved and obedient companions. Overall, the Kerry Blue Terrier is a spirited and lovable breed that has won the hearts of many dog lovers over the years.