Chihuahuas are courageous little watchdogs who are more than willing to defend their territory against strange people and dogs. The Chihuahua has a distinctive headpiece that is essential to correct breed type. Viewed from the side, the line of the skull should curve in a semi-circle from the occiput around to the muzzle. 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.