Miracle, the 1.5 oz. Jack Russell-Chihuahua Mix Weighing in at 1.5 oz., Miracle was the only of a litter of five Jack Russell Chihuahua-cross-breeds to survive. Abandoned by her mother at birth, the pup's 10-year-old owner Kayley-May Coles of Swindon, U.K. has been feeding her special dog milk through a syringe for the past nine days.