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The Jack Russell Terrier is a small, principally white-bodied, smooth or rough-coated terrier that has its origins in fox hunting. The name "Jack Russell" has been used over the years to describe a wide array of small white terriers, but now after a drawn out legal battle the JRTCA (Jack Russell Terrier Club of America) and its affiliates have won the exclusive rights to use the name Jack Russell Terrier to describe their particular variant of the dog).  Commonly confused with the Parson Russell Terrier, the AKC and affiliate variant, and the Russell Terrier, a shorter legged, stockier variety, the working Jack Russell Terrier is a unique terrier which has been preserved in working ability as well as appearance much as it existed over 200 years ago.

Jack Russells are sturdy and tough, measuring between 10" and 15" at the shoulder. The body length must be in proportion to the height, and the dog should present a compact, balanced image. Predominantly white in coloration (more than 51%) with black and/or tan markings, they exhibit a smooth, broken or rough coat. The skin can sometimes show a pattern of small black or brown spots, referred to as "ticking", that do not carry through to the outer coat. All coat types should be dense double coats that are neither silky (in the case of smooth coats) nor woolly (in the case of rough coats). The head should be of moderate width at the ears, narrowing to the eyes, and slightly flat between the ears. There should be a defined stop at the end of the muzzle where it meets the head but not overpronounced, with a black nose. The jaw should be powerful and well boned with a scissor bite and straight teeth. The eyes are almond shaped and dark colored, and should be full of life and intelligence. Small V-shaped ears of moderate thickness are carried forward on the head. When the dog is alert the tip of the V should not extend past the outer corner of the eyes. The tail is set high and in the past was docked to approximately five inches in order to provide a sufficient hand-hold for gripping the terrier. It is a serious fault for the dog to have its tail down when in the show ring. The Jack Russell should always appear balanced and alert, As the Jack Russell is primarily a working terrier, their most important physical characteristic is their chest size, which must not be so large that it prevents the dog from entering and working in burrows. The red fox is the traditional quarry of the Jack Russell Terrier (JRT) so the working Jack Russell must be small enough to pursue its quarry. Red foxes vary in size, but across the world they average about 14 pounds in weight and have an average chest size of 12-14 inches at the widest part.
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review by . April 14, 2009
Jada the Jack Russell Terrier
We have a Jack Russell and her name is Jada. She has a lot of energy and loves to run and play. If you're the lazy sit-on-the-couch-all-day kind of person then this breed may not be great for you because these dogs need lots of exercise. We love to take Jada to our local dog park because it helps her develop socialization and because, though she's usually the smallest, she is always the fastest beating out every other dog in retrieval. It definitely makes her stand out despite her size. On that …
Quick Tip by . June 14, 2010
Jack Russels are a hoot. But you'd sure better love getting LOTS of exercise! They'll definitely keep you running 'cause they just never stop.
Quick Tip by . October 08, 2009
Probably the only type of dog I would get. They're smart, fast and star in old prime time shows such as Frasier.
Jack Russell Terrier
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