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 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.
Jack Russells are an energetic breed that rely on a high level of exercise and stimulation, and are relatively free from serious health complaints. Originating from dogs bred and used by
Reverend John Russell in the early 19th century, from whom the breed takes its name, the Jack Russell has similar origins to the modern
Fox terrier. It has gone through several changes over the years, corresponding to different use and breed standards set by kennel clubs. Recognition by kennel clubs for the Jack Russell breed has been opposed by the breed's parent societies – which resulted in the breeding and recognition of the
Parson Russell terrier. Jack Russells have appeared many times in film, television and print - with several historical dogs of note.
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