The only real way that I know to determine what a yorkie will look like is to see the parents and if possible other pups from the pairing. My breeder specialized in dark coat yorkies and sure enough thats what chloe is
Also the average weight of a healthy yorkie is between 5 to 7 pounds. A very small yorkie 3 to 4 requires special care. I would really caution against selecting a smaller than normal pup and would be wary of any breeder that states they specialize in "teacup yorkies" Yorkies of average size are already really little dogs. Hope this helps