The Jack Chi is a hybrid breed that is a cross between a Jack Russell Terrier and aChihuahua. This breed is small in size, weighing between 8 to 18 pounds and standing at a height of 14 to 15 inches. This breed has a lifespan of 13 to 18 years. The Jack Chi is known for its energetic, alert, friendly, affectionate, playful, and sweet temperament. It is an ideal companion for singles, as well as families with children and other pets, living in a house or apartment, with or without a yard.