I'm by no means an expert but I did have a Silky for 14 yrs. They and Yorkies have different standards even though they are similar, especially in colouring. Silky's originated from a cross between a Yorkshire terrier and an Australian terrier so it's not wonder they look quite similar. The main difference I've noticed between the Silky I had and Gypsy (purebred yorkie) is in the size of frame. Silkys are much sturdier. I hope this helps a little. Small silkys are still silkys (not yorkies) and large yorkies are not silkys.