Chi. hua. hua \ch*-‘wa:-(.)WA\ n [ MexSp, fr. Chihuahua, Mexico]: a very small, round-headed, large-eared, short-coated dog held believed to actually come from Egypt and Aztec civilizations (truth be known, teacup only refers to an individual dog, not a breed).
The Chihuahua is an ancient breed which is believed to have its origins in the late Paleozoic period. The Chihuahua’s earliest known ancestor, cannis raptor rodentis (meaning: killer half dog, half mouse) scoured the almost uninhabitable deserts of what is now Mexico and the south-western United States pillaging without restraint.
Millions of years of evolution allowed this canine species to thrive on the arid plain while other dog species, such as the cannis wimpus or frenchus dorkus (desert poodle) struggled for survival, eventually becoming extinct until modern times.