There are several different reasons why one would refer to a Yorkshire Terrier as a Teddy Bear Yorkshire Terrier.
We would like to first point out that there is only one standard for this breed that is recognized by the AKC and other reputable kennel clubs with no official offshoots that vary in appearance.
Some breeds do have variations, this is most often due to size…The Beagle for example.
The Yorkshire Terrier has only 1 accepted standard of appearance. This covers everything from weight, length of tail, the size and coloring of the eyes, even the shape of the paws.
So, due to the above facts, A Teddy Bear Yorkie is not an official type of dog. The term is used as a description. The words themselves are adjectives. As you know, an adjective modifies a noun by describing or identifying it.
With this said, the term is used in many different ways. One of the reasons why it is used in such a broad sense is that it is a fairly new term. It is actually thought to be borrowed from references to the Pomeranian breed.
Over the past few decades, more and more breeders began to refer to some puppies
as “Teddy Bear Poms” and the term became so popular that it was carried over to the Yorkshire Terrier breed.
Since it really had no official meaning, breeders and others would use it…but there was no agreement to what it meant…no consensus as to exactly what the term was to imply.