Hi Guest,
If you're looking for a 'short-haired' Yorkie, you will be sorely disappointed. Yorkies have hair like people do. It means it keeps growing and doesn't have a shedding (moulting) cycle like the majority of dogs. It's not that difficult to keep trimmed short with scissors, especially along the belly area where a lot of tangles occur :)
The benefit is a dog that's rather easy to care for, imo. No shedding hair to pick up around the house and the likelihood of having problems with allergies tends to be decreased.
best wishes,
toodles