The Jack Russell Terrier is a British breed of small terrier. It is principally white-bodied and may have a smooth, rough, or broken coat, with markings of various colours. It derives from dogs bred and used for fox-hunting in North Devon in the early nineteenth century by a country parson, Jack Russell – for whom the breed is named – and has similar origins to the modern Fox Terrier. Though closely similar, it is a distinct and different breed from the Parson Russell Terrier. Jack Russells are an energetic breed that rely on a high level of exercise and stimulation. 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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