Full and round but not protruding, well balanced and set well apart. The color should be luminous dark or luminous ruby (luminous means bright). Light eyes are okay in blonde or white Chihuahuas. Blue eyes and different colored eyes are considered a serious fault.
Ears should be large, erect and standing upright when alert but should move to a 40 degree angle when in response. Cropped ears will disqualify the dog.
Stop (the indentation between the eyes where the nasal bone and cranium meet)
The stop should be well defined and form a 90 degree angle, from a side view, where the muzzle joins the skull.
Muzzle (everything in front of the eyes)
The muzzle should be moderately short and slightly pointed.
Self-colored, which means the same color all over, except for lighter shades. In blonde Chihuahuas, a pink nose is acceptable.
They should have a level bite (when the front teeth of the upper and lower jaws meet exactly edge to edge) or a scissor bite (when the the outer side of the lower incisors touches the inner side of the upper incisors). An under-bite or over-bite is penalized as a serious fault. One or two missing teeth is acceptable.
Slightly arched, gracefully sloping into lean shoulders.
Topline (outline from shoulders to tail)