The stop is vertical with the line of the skull forming a 90-degree angle where it joins the muzzle. A molera may be present. Cheeks are clean. The muzzle is moderately short and somewhat pointed, although it should be broad and deep enough to support healthy dentition. Viewed from the side, the bridge of the muzzle forms a right angle to the line of the forehead.
Lips are tight and clean.
The Chihuahua has a complete set of evenly spaced, white teeth meeting in a scissors or level bite. Nose color varies with coat color. Eyes are large and full but not protruding, and set well apart. Expression is bright and the eyes are luminous. Ears are large, erect, and set so that the bottom edge of the ear is attached at the same level as the outer corner of the eye.