Chihuahua

"Chihuahuas are energetic, noisy Petz that are always ready to play!" The Chihuahua is a breed of dog that first appeared in Dogz. They were first known as ChiChi, and importing a ChiChi into Petz II will give you a Chihuahua.

They tend to be referred to as "Chis."

Dogz
"The ChiChi breed, like chihuahuas, love to play fetch. Their favorite thing in the world is chasing that ball! Getting them to give it back is another story..."  - Dogz 

Dogz II
"Dogz of the Chihuahua breed are a peculiar if not lovable mix of wiry nerves and insatiable curiosity. Chihuahuas love to be the center of attention, and will generally stop at nothing to get your or another Dogz' notice; this might include littering your desktop with toyz or barging in on anything another Dogz is doing. Both agile and fast, Chihuahuas are great at playing Flying Disc and catching other toyz in the air. They require daily exercise to stay healthy and sleep in short restless spurts. With a constant stream of affection, your Chihuahua will eventually calm down, but if it catches you petting another Dogz, you'll be sure to hear about it!" - Petz.com "Dogz of this breed are nervous, high-strung and jealous of other Petz, but with lots of love and reassurance, they eventually calm down."  - Dogz 3