The Jack Russell Terrier is a small terrier that has its origins in fox hunting; it is principally white-bodied and smooth, rough or broken-coated. It is commonly 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 commonly misapplied to other small white terriers.
The Jack Russell is a broad type, with a size range of 10–15 inches (25–38 cm). The Parson Russell is limited only to a middle range with a standard size of 12–14 inches (30–36 cm), while the Russell terrier is smaller at 8–12 inches (20–30 cm). Each breed has different physical proportions according to the standards of their breed clubs.
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