Toy dog - Wikipedia, the free encyclopedia
Here's a summary.... a yorkie is not a "toy yorkie" or a "teacup yorkie".... a yorkie might be a toy breed or in the teacup size but... the two names don't go together. Teacup yorkie or toy yorkie don't go together... it's a yorkie.
wiki has a pretty decent summary as to why.... poor health and poor breeders ethics.