I believe most people give their Yorkies the petite bones. I give Fred the Petite sized ones but I break it in half.
http://www.petco.com/assets/product_...286300301B.jpg
Petite for dogs 10 - 20 lbs.
But sometimes, I give Fred the teeny tiny Lil Bits!
http://www.petco.com/assets/product_...286300139B.jpg
lil' bits for dogs under 10 lbs./less than 6 month
The normal ones, you would probably have to cut into 3rds! It might be too big for your little one. But thats just my opinion!