The Heeler is a normally proportioned, rugged dog with pricked (standing up) ears and long legs. The breed's most distinctive feature, for which the breed is named, is the frequent lack of a tail. When there is a tail, it is quite short, no longer than 10 cm (4 in. ), and undocked. The coat is medium length to short, straight, dense and harsh. The coat color is a speckled red or speckled blue. Heelers do not show brown points or markings as seen on the ACD. Height is  46–51 centimetres (18–20 in) at the withers for dogs, with females slightly smaller. Blue Heelers (a.k.a. 'Queensland Heeler') (with a long tail) is similar in appearance to the Heeler, but the Australian Cattle Dog is proportionally heavier, less leggy and has brown points and markings. (See the article Dog terminology for an explanation of terms.)