(Within the Fédération Cynologique Internationale, the 'Russell terrier' is also known as 'Jack Russell terrier'.) The term 'Jack Russell' is also commonly misapplied to other small tan and white terriers. The Jack Russell is a broad type, with a size range of 25–38 cm (10–15 in). The red fox is the traditional quarry of the Jack Russell terrier, so the working Jack Russell must be small enough to pursue it. Red foxes vary in size, but across the world, they average from 6–8 kg (13–17 lb) in weight and have an average chest size of 30–36 cm (12–14 in) at the widest part.
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