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The Jack Russell Terrier is a cheerful, energetic dog with a great need to serve people. She feels best in the company of a person, completing the task. Digging for the Jack Russell Terrier is in the order of things, especially if he decides that his job is to rid your yard of rodents! The ability to hunt is imparted to these dogs as a result of selection and is their natural state. The hunting instinct combined with the high energy level makes training a must for this breed. To compete with Jack Russell in stubbornness is an empty matter, he will always come out the winner.