The Jack Russell Terrier is a small terrier that has its origins in fox hunting in England. It is principally white-bodied and smooth, rough or broken-coated and can be any colour. Small tan and white terriers that technically belong to other breeds are sometimes known erroneously as "Jack Russells". Each breed has different physical characteristics according to the standards of their national breed clubs; size and proportions are often used to tell them apart. Some authorities recognize a similar but separate breed as the Russell Terrier – a shorter-legged, stockier dog, with a range of 20–30 cm (8–12 in)

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 Rev. 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.

Origin: England
Weight: 6–8 kg (14–18 lb)