Though the Cardigan is allowed more colors than the Pembroke, white should not predominate in its coat. The Cardigan is a double-coated dog where the outer coat is dense, slightly harsh in texture, and of medium length. The dog's undercoat is short, soft, and thick. According to the breed standard, the breed stands between at the withers, and should weigh . The skeletal structure of the Cardigan differs from the Pembroke, in that a more exaggerated bend exists in the front two legs, which fits around the ribcage of the animal. In addition, the Cardigan is more heavily set than the Pembroke, with denser bone mass. A greater number of colours of coat is present in the Cardigan breed than the Pembroke, with the breed standard allowing for a variety of shades of red, sable, and brindle. White markings are expected on this breed of Corgi, and one with a black coat is allowed to have tan or brindle points under conformation show rules. Merle markings are present in the breed, although this is normally restricted to blue merle. Several disqualification criteria are used in the breed standard for the purpose of confirmation shows. This would include drop ears, a white coat, blue eyes, or nonsolid black noses in dogs without merle coloration. Pembroke Welsh Corgi Pembrokes feature pointed ears, and are somewhat smaller in stature than the Cardigan. They are low-set, intelligent, strong, and sturdy with stamina sufficient to work a day on the farm. The common height at the withers is , while a male dog of this breed should weigh no more than , and a female . The tail is shorter than that of a Cardigan, which can be accomplished through breeding or docking. Historically, the Pembroke was a breed with a natural bobtail (a very short tail). Due to the advent of tail docking in dogs, the bobtail was not aggressively pursued, with breeders focusing, instead, on other characteristics, and the tail was artificially shortened if need be. Given that some countries now ban docking, some breeders are again attempting to select dogs with the genes for natural bobtails. Fewer colours of coat appear in the Pembroke breed. These include red, sable, tan, fawn, and black, each of which can be with or without white markings. Plain white or grey coats can also be seen, but these would be considered to be a serious fault