When viewed from the side, the muzzle is slightly shorter than the skull and joined by a definite stop. The planes of the skull and muzzle are parallel. The skull is flat and moderately broad, tapering slightly toward the muzzle. Cheeks are well developed. There is a minimum of falling away under the eye, giving a moderately chiseled look.
Lips are tight and darkly pigmented.
The Russell Terrier has a complete set of comparatively large, evenly spaced, white teeth meeting in a scissors bite. The nose is black and fully pigmented. Eyelids are tight. Eyerims are black. The Russell Terrier has small, V-shaped button or drop ears of great mobility.