Emmie loves loves loves these tiny little treats called Nature's Recipe Training Treats at Petsmart. They are real small, chewy and look like little mini steaks. They were $1.99 for a 3.5 oz container.
Another treat she really loves loves are these chewy jerky sticks called Lickin' Logs by Mouthfuls, Inc. I purchased these at a little boutique store close to where I live. I purchased the cell bag which contains about 13 sticks which are about 4.5 inches long. Just thought I would add because I didn't see the amount it contained on the website. I guess they also come in a carton, but not sure how many come in this size. The website on the package is
http://www.mouthfuls.net
Emmie really loves both of these treats and I'm sure your yorkie will love them as well. Hope this helps!!