Size: Dogs should measure approximately 23 in. (58 cm) in height at the shoulder; bitches, slightly less. Both sexes should be sturdy, well muscled and well boned.
Coat Color: Should be hard, dense and wiry, lying straight and close, covering the dog well over the body and legs. Some of the hardest are crinkling or just slightly waved. At the base of the hard very stiff hair should be a shorter growth of softer hair termed the undercoat. The head and ears should be tan, the ears being of a darker shade than the rest. Dark markings on either side of the skull are permissible. The legs up to the thighs and elbows and the under part of the body and chest are also tan and the tan frequently runs into the shoulder. The sides and upper parts of the body should be black or dark grizzle. A red mixture is often found in the black and is not to be considered objectionable. A small white blaze on the chest is a characteristic of certain strains of the breed.