Davies, a friend of Russell's, wrote: 'Trump was such an animal as Russell had only seen in his dreams'. She was the basis for a breeding program to develop a terrier with high stamina for the hunt as well as the courage and formation to chase out foxes that had gone to ground. By the 1850s, these dogs were recognised as a distinct breed.An important attribute in this dog was a tempered aggressiveness that would provide the necessary drive to pursue and bolt the fox, without resulting in physical harm to the quarry and effectively ending the chase, which was considered unsporting. A broken-coated dog may have longer hair on the tail or face than that which is seen on a smooth-coated dog. As it is primarily a working terrier, its most important physical characteristic is its chest size, which must not be so large that it prevents the dog from entering and working in burrows. The red fox is the traditional quarry of the Jack Russell terrier, so the working Jack Russell must be small enough to pursue it.
[{"unique_features": "chest size, which must not be so large that it prevents the dog from entering and working in burrows", "on_its_face": "no"}]
[{"unique_features": "chest size, which must not be so large that it prevents the dog from entering and working in burrows", "on_its_face": "no"}] [{"unique_features": "n/a", "on_its_face": "n/a"}]