The miniature size (13 inches and under as defined by the UKC) is becoming increasingly popular as a house pet and companion dog, but the miniature is still a hunting dog. The standard says 'small to medium'  and the miniature is small enough to go in and under those places where vermin like to hide. The tail has been traditionally docked to about 2–3 inches, but the bobtail gene is very common in Rat Terriers and can result in a variety of tail lengths. Today, some breeders prefer a natural, undocked tail, which is accepted in the breed standards.
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