There's no height standard to distinguish between Yorkie vs Silky Terrier.
There may be a range of ideal Yorkie heights/ratios for the Show Ring. But for pet quality, there are Yorkies that have short tiny legs and ones that have long lanky legs.
For example, my Scottie has gorgeous long legs. Casie on the other hand has a body that's the same length as Scottie's, but she's half his height. They were both offspring of standard show quality Yorkies
