The Fox Terrier Club's description leaving little to be desired as to the show points of the Terrier, the author has taken the liberty of reproducing it as issued by that body.
Standard of Points Recommended by the Fox Terrier Club
Head and Ears (value 15).—The skull should be flat and moderately narrow, and gradually decreasing in width to the eyes. Not much "stop" should be apparent, but there should be more dip in the profile between the forehead and top jaw than is seen in the case of a Greyhound.
The cheeks must not be full.
The ears should be V-shaped and small, of moderate thickness, and dropping forward close to the cheek, not hanging by the side of the head like those of a Foxhound.
The jaw, upper and under, should be strong and muscular; should be of fair punishing strength, but not so in any way to resemble the Greyhound or modern English Terrier. There should not be much falling away below the eyes. This part of the head should, however, be moderately chiselled out, so as not to go down in a straight line like a wedge.
The nose, towards which the muzzle must gradually taper, should be black.
The eyes should be dark in colour, small, and rather deep-set, full of fire, life, and intelligence; as nearly as possible circular in shape.
The teeth should be as nearly as possible level, i.e., the upper teeth on the outside of the lower teeth.