What is it about her that makes you think she is not purebred? they go through a lot of changes in their first year, and each of them does it in their own way. There are a variety of coat textures and colors and a huge range of sizes. there are floppy ears and perky ears, long noses and short noses.
If you post a picture we might be able to tell you more. There are a lot of good breeders on here that know a yorkie when they see one. |