Size: The height at shoulder to be 15 inches (38 cm) for dogs, bitches proportionately less. Twenty lbs. (9 kg) shall be considered a fair average weight in working condition, but this may vary 1 lb. (.5 kg) or so either way.

Coat and Colour: The coat should be wiry, hard, very close and abundant. The colour should be black and tan, or black grizzle and tan, free from black pencilling on toes.

Head: The skull should be flat, and rather wider between the ears than the Wirehaired Fox Terrier. Stop not too defined, fair length from stop to end of nose, the latter being of a black colour. The jaw should be powerful, clean-cut, rather deep, and more punishing - giving the head a more masculine appearance than that usually seen on a Fox Terrier. The eyes should be small, not being too deeply set in or protruding out of skull, of a dark hazel colour, expressive and indicating abundant pluck. The ears should be V-shaped, small, not too thin, set on fairly high, carried forward and close to the cheek.

Neck: The neck should be of moderate length and thickness, slightly arched and sloping gracefully into the shoulders.

Forequarters: The shoulders should be long, sloping, and well set back. The legs should be straight and muscular, possessing fair amount of bone, with upright and powerful pasterns. The feet should be small, round, and cat-like.

Body: The back should be short, and well ribbed up, good depth, moderate width of chest, and the loin strong.

Hindquarters: The hindquarters should be strong, thighs muscular and of good length, with the hocks moderately straight, well let down, and fair amount of bone.

Tail: The stern should be set on moderately high, but not too gaily carried.

Disqualifications:
1. Nose white, cherry, or spotted to a considerable extent with either of these colours.
2. Ears prick, tulip, or rose.
3. Undershot jaw or pig jawed mouth.
4. Black below hocks or white to a considerable extent.