Due to their working nature, Jack Russell terriers remain much as they were some 200 years ago. They are sturdy, tough, and tenacious, measuring between 25–38 cm (10–15 in) at the withers, and weigh 6–8 kg (14–18 lb). The body length must be in proportion to the height, and the dog should present a compact, balanced image. Predominantly white in coloration (more than 51%) with black and/or brown and/or tan markings, they exhibit either a smooth, rough or a combination of both which is known as a broken coat. 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.
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