The Jack Russell Terrier was developed in nineteenth-century Devon, England, by the Reverend John Russell, who wanted a white terrier that could keep up with hounds and bolt foxes from their dens. Today's dogs are compact, about 10 to 15 inches tall and 13 to 18 pounds, mostly white with black or tan markings and a smooth, broken or rough coat.
That working past explains the personality: bold, clever, tireless and prone to digging, climbing and escaping. In Syracuse, where fences, snowbanks and a long indoor season all test a terrier's creativity, daily vigorous exercise and training matter. Many Jacks land in shelters because their energy was underestimated, though dogs vary and each one's history and habits count.