ジャック・ラッセル・テリア
The Russell Terrier, which is also sometimes called the English Jack Russell terrier or the Short Jack Russell terrier is a generally smaller related breed. Both the breed standards of the American Russell Terrier Club and the English Jack Russell Terrier Club Alliance states that at the withers it should be an ideal height of . Although sometimes called the English or Irish Jack Russell terrier, this is not the recognised height of Jack Russells in the United Kingdom. According to the Jack Russell Club of Great Britain's breed standard, it is the same size as the standard for Jack Russells in the United States, . Compared to the Parson Russell Terrier, the Russell Terrier should always be longer than tall at the withers, whereas the Parson Russell's points should be of equal distance. The Fédération Cynologique Internationale standard for the Jack Russell terrier has this smaller size listed as a requirement. Terrierman Eddie Chapman, who has hunted in Devon for more than 30 years, the same area that John Russell himself hunted, notes that, "I can state categorically that if given the choice, ninety-nine percent of hunt terrier men would buy an under worker, if it was available, over a one."