probably xsmall cause yoekies are so tiny but maybe xxsmall u can just take your dog with you or ask people at the stores unless you shop online in which case thts probably why u asked this questio but i would say xsmall then if its too big then shrink it in the dryer
It tends to say on the clothing pattern what size and what general breeds it covers. The general guideline for Yorkies is xx-Small-xSmall-Small. Cause some are smaller than others, and some are Larger, but it depends on the size, what "type" of clothing, and genetics of the Yorkie.