The word "teacup" is basically a marketing gimmick to promote the idea of a very small toy breed dog. Whether it is a poodle, maltese, chi, or yorkie some like to throw the word "teacup" to imply that their puppies will stay very tiny.
With this said, the real issue with people that are looking to purchase very small "teacup" puppies is that the female and male need to be very small as well. Breed standard is under 7 lbs and most reputable breeders will not use a Yorkie under 5 for breeding. This is part of the contoversy of the "teacup" pup, breeding very tiny females has the risks of csection and many other complications. Then you have very tiny pups that are born and sold that are very delicate and new owners are not aware of the dangers involved with owning a 2 or 3 lb adult dog. As you can see it is not just the puppy that is produced to sell and market as a "teacup" it is also the idea of the lineage to produce such tiny offspring.
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