The underjaw is strong. There is a minimum of falling away under the eye, giving a moderately chiselled look. Lips are tight and darkly pigmented. The Kerry Blue Terrier has a complete set of good-sized, evenly spaced, white teeth. A scissors bite is preferred but a level bite is acceptable.
Nose is black with large, wide nostrils.
Eyes are small, round, dark in color, and set moderately wide apart. Expression is full of fire and intelligence. Button ears are proportionate to the size of the dog, set on high, and of moderate thickness. The ears are carried close to the cheeks with the top fold of the ear slightly above the level of the skull. The neck is of moderate length, carried proudly with a slight arch at the crest.