You will find that much of the general pubic seems to feel they are experts on what size a Yorkie should be and what it should look like. There are so many people breeding Yorkies without regard to the breed standard that there are many sizes and types of Yorkies out there. Not many of them are actually representative of the breed though. If someone starts to tell you what your Yorkie should look like or what size it should be just ask them if they have ever read the breed standard. More than likely they have made their decision about what your dog should look like without any real knowledge of the breed.
Yorkshire Terrier Club of America