Chip is predominantly a Yorkie, and I'm pretty sure part Chihuahua. He was a rescue so I have no idea to be sure. I call him a Yorhuahua, but I have also heard Yorkihuahua, and Chorkie. When he was first adopted he was super skinny, less than 10lbs now he has grown into a little over 14lbs. You can see pics of him on his Dogster page
http://www.dogster.com/dogs/596293