chihuahuas are characterized by the american kennel club under the toy group breed and follow these specific show standards:
general appearance – a graceful, alert, swift-moving little dog with saucy expression, compact, and with terrier-like qualities of temperament.
weight – a well balanced little dog not to exceed 6 pounds.
proportion – the body is off-square; hence, slightly longer when measured from point of shoulder to point of buttocks, than height at the withers. somewhat shorter bodies are preferred in males.
disqualification – any dog over 6 pounds in weight.
head – a well rounded “apple dome” skull, with or without molera. expression – saucy.
eyes – full, but not protruding, balanced, set well apart-luminous dark or luminous ruby.
(light eyes in blond or white-colored dogs permissible.)
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…