Which breed of dog is this?

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.

The Jack Russell is frequently confused with the Parson Russell Terrier and the Russell terrier, which is a shorter-legged, stockier variety. The term "Jack Russell" is also commonly misapplied to other small 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). Each breed has different physical proportions according to the standards of their 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.

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.