A graceful, alert, swift-moving compact little dog with saucy expression, and with terrier-like qualities of temperament.
A well rounded "apple dome" skull, with or without molera. Expression - Saucy. Eyes - Full, round, but not protruding, balanced, set well apart-luminous dark or luminous ruby. Light eyes in blond or white-colored dogs permissible. Blue eyes or a difference in the color of the iris in the two eyes, or two different colors within one iris should be considered a serious fault. Ears - Large, erect type ears, held more upright when alert, but flaring to the sides at a 45 degree angle when in repose, giving breadth between the ears. Stop - Well defined. When viewed in profile, it forms a near 90 degree angle where muzzle joins skull.
Neck, Topline, Body: Neck - Slightly arched, gracefully sloping into lean shoulders. Topline- Level. Body -Ribs rounded and well sprung (but not too much "barrel-shaped"). Tail - Moderately long, carried sickle either up or out, or in a loop over the back with tip just touching the back. (Never tucked between legs.) Disqualifications - Docked tail, bobtail.
Forequarters: Shoulders - Lean, sloping into a slightly broadening support above straight forelegs that set well under, giving free movement at the elbows. Shoulders should be well up, giving balance and soundness, sloping into a level back (never down or low). This gives a well developed chest and strength of forequarters. Feet - A small, dainty foot with toes well split up but not spread, pads cushioned. (Neither the hare nor the cat foot.) Dewclaws may be removed. Pasterns - Strong.
In the Smooth Coats, the coat should be of soft texture, close and glossy. (Heavier coats with undercoats permissible.) Coat placed well over body with ruff on neck preferred, and more scanty on head and ears. Hair on tail preferred furry. In Long Coats, the coat should be of a soft texture, either flat or slightly wavy, with undercoat preferred. Ears - Fringed. Tail - Full and long (as a plume). Feathering on feet and legs, pants on hind legs and large ruff on the neck desired and preferred. (The Chihuahua should be groomed only to create a neat appearance.) Disqualification - In Long Coats, too thin coat that resembles bareness.
Muscular, with hocks well apart, neither out nor in, well let down, firm and sturdy. Angulation - Should equal that of forequarters. The feet are as in front. Dewclaws may be removed.