Pure-bred Jack Russell Terrier Email us via email ...((barbaratellini15@gmail.com)) for more details and video about the them . Junior a tri color Jack Russell terrier. He is only 1 year old right now weights in 14 pounds .I do not plan to breed him until he\'s 2 years old or older. I like to make sure he is mature and healthy enough to breed. He very intelligent and trained since he was a puppy. He listens off leash and loves to run in the woods chasing squirrels .