Wow I thought parti was just another color of the yorkie just like all the colors of the dachshund, they have so many colors even the piebald I have one and he is adorable... I have also seen the parti yorkies and they are just like a regular yorkie except white w/ different colors ... that is the only thing that is different, I don't see why a certian color would make it a totaly different breed... it will still act like a reg yorkie ... just like my piebald dachshund he still acts like a dachshund...
