Following World War II, the requirement for hunting dogs drastically declined, and with it the numbers of Jack Russell terriers. The dogs were increasingly used as family and companion dogs. Further crossbreeding occurred, with Welsh corgis, Chihuahuas, and other smaller breeds of terrier. 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. He was reported to have charged at them and held them at bay long enough for the children to get away.
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