The term 'Jack Russell' is also commonly misapplied to other small tan and 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). Originating from dogs bred and used by the 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. Owned by explorers Ranulph and Ginny Fiennes, he became the first dog to travel to both the north and south poles. This feat is unlikely to be repeated, as all dogs have been banned from Antarctica by the Antarctic Treaty nations since 1994, due to fears that they could transmit diseases to the native seal population.
[{"countries": "n/a", "ownership_banned_or_restricted": "n/a"}]
[{"countries": "n/a", "ownership_banned_or_restricted": "n/a"}] [{"countries": "Antarctica", "ownership_banned_or_restricted": "yes"}]