To differentiate, the AKC renamed the breed to Parson Russell Terrier, while the Jack Russell Terrier Club of America (JRTCA) retains the name Jack Russell and considers the breed solely a hunting dog. Temperament: Jack Russell Terriers are athletic, tenacious, and highly energetic little dogs. They're smart, but have a tendency to be a bit. Jack Russell Terrier Puppy FOR SALE near ALPHARETTA, Georgia, USA. Age: 3 Years 3 Months Old. Nickname: Pup pup on PuppyFinder.com.