The Jack Russell Terrier is a small terrier that has its origins in fox hunting in England. Davies, a friend of Russell's, wrote: 'Trump was such an animal as Russell had only seen in his dreams'. Jack Russells are first and foremost a working terrier. Originally bred to bolt foxes from their dens during hunts, they are used on numerous ground-dwelling quarry such as groundhog, badger, and red and grey fox. The working JRT is required to locate quarry in the earth, and then either bolt it or hold it in place until they are dug to.