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British Jack Russell Terriers are a product of several extinct breeds and is not recognized as an official breed by the Kennel club The small white-fox working terriers we know today were first bred by the Reverend John Russell, a parson and hunting enthusiast born in 1795, and they can trace their origin to the now extinct English White terrier.Difficulty in differentiating the dog from the creature it was pursuing brought about the need for a mostly white dogThe Jack Russell is an energetic breed that relies on a high level of exercise and stimulation and is relatively free from serious health complaints. Originating from dogs bred and used by Reverend John Russell in the early 19th century, it 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.