(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 tan and white terriers. The Jack Russell is a broad type, with a size range of 25–38 cm (10–15 in). Each breed has different physical proportions according to the standards of their national breed clubs. Jack Russells are an energetic breed that rely on a high level of exercise and stimulation. They are relatively free from any serious health complaints. 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. It is not uncommon for these dogs to become moody or destructive if not properly stimulated and exercised, as they have a tendency to bore easily and will often create their own fun when left alone to entertain themselves. 4.1 Eye disorders.
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