A broken-coated dog may have longer hair on the tail or face than that which is seen on a smooth-coated dog. The skin can sometimes show a pattern of small black or brown spots, referred to as 'ticking' that do not carry through to the outer coat. To accomplish this, the dog will not bark but will expect attention to the quarry continuously. Because the preservation of this working ability is of highest importance to most registered JRTCA/JRTCGB breeders, Jack Russells tend to be extremely intelligent, athletic, fearless, and vocal dogs.
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