The Jack Russell is frequently confused with the Parson Russell terrier (see the American Kennel Club) and the Russell terrier, which is a shorter-legged, stockier variety. (Within the Fédération Cynologique Internationale, the “Russell terrier” is also known as “Jack Russell terrier”.) The term “Jack Russell” is also commonly misapplied to other small white terriers. The Jack Russell is a broad type, with a size range of 25–38 cm (10–15 in). The Parson Russell is limited only to a middle range with a standard size of 30–36 cm (12–14 in), while the Russell terrier is smaller at 20–30 cm (8–12 in). Each breed has different physical proportions according to the standards of their breed clubs.
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