Yorkies are special because:
They're usually small enough you can take them almost anywhere
They're so cute that even if they aren't supposed to be somewhere, people will let you bring them in anyway
They're GREAT watchdogs!
They're so sweet and loving and smart
They don't shed
They're not yappy like I thought they were before I got one
They love to just be with you and cuddle
They sleep all night with you
When you have to clean up their poop, it's small

You can give them a bath in the sink in about 5 minutes
They're just such GOOD dogs