 The first true breed of working terrier that bears a resemblance to what we see in the field today is the Jack Russell Terrier.The Jack Russell Terrier is named after the Reverend John Russell, whose long life (1795–1883) encompasses the entire early history of mounted fox hunts in the UK and who is credited with breeding the first fox-working white-bodied terrier used in the field today.With the rise of the Enclosure Movement in the late 18th Century and early 19th Century came the control of sires and the rapid improvement in livestock herds.