what are the risks in having a teacup yorkie pup?

First, there is no such thing as a Teacup anything. Anyone who is trying to tell you that they have one is lying to you, violating the rules or the YTCA, and is trying to scam you.

So, with that, the most "moral" risk is that you are supporting a bad industry. It's giving money to people who are breeding poor quality dogs to try and make money.

Because they are using poor quality dogs, the chances are MUCH higher that any dog from them will be sick. Since they don't screen for genetic ailments and provide only minimal vet care (the dollar is most important), many of these already fragile dogs end up having sever issues. Patella problems can be $2000 PER LEG to fix. Liver Shunts can be fatal. Etc.

Avoid anyone advertising "teacup" dogs. Instead, use a responsible breeder who adheres to the AKC responsible breeding guidelines and the codes of ethics set forth by the Yorkshire Terrier Breed Club. Settle for nothing less.

http://www.akc.org/breeders/resp_breeding/index.cfm

http://www.geocities.com/bluegracepwd/wheretobuy.html

http://dogplay.com/GettingDog/index.html

http://www.ytca.org
References :

There is no such thing as a "teacup" in any breed. All they are is undersized dogs bred by unscrupulous backyard breeders who do absolutely no health checks on their breeding stock. If you want a yorkie, get a yorkie, don't get some poor quality undersized dog that's liable to have nothing but health and/or temperament problems its whole life!
References :

We're petsitting two adorable little Yorkie puppies right now, and they're great! Just make sure the you don't go for a breeder who is advertising for a "teacup" or "tiny" dog- tiny dogs are prone to a lot of health risks because the breeders are trying to make them smaller and smaller.Go for a "normal-sized" Yorkie.

Since they are a toy breed and are already small- they have small bladders. We have "pee pads" laid on the livingroom floor. It's one thing you have to think about, but I know not all small dogs need them. But there are less accidents in the house because of the pee pads. If you think pee pads might bother you, reconsider such a small breed.

We also have to watch where we step, pay close attention when opening and closing doors, and wake up several times in the middle of the night to let them go potty outside (again, small bladders!). It's like having a newborn baby in the house!

Good luck if you do get a Yorkie, they're adorable dogs!
References :

They are adorable. If you think you have the time, money and patience to train one, and afford vet bills in good times and bad - go for it!

Small dog disadvantages: They are harder to train to go potty outdoors. They have a tendency to be nervous. They get stepped on. Stolen more often. Easier to lose by accident! Jump up on people. More possessive of their owners. Some have big dog syndrome - they think they can beat up a bigger dog! The worse thing about smaller dogs that I worry about constantly - other dogs which are larger hurting or killing the smaller dog. And, you have to careful of children and babies. They may hurt the dog and it will probably react by defending itself.

However, there are lots of advantages in having a small dog. For one thing, the yorkie is not going to need a tremendous amount of exercise. They do need some, but not miles of it. Taking a small dog travelling is much easier. Boarding them is usually cheaper (smaller cage requirements). Feeding them is inexpensive. You can afford a high quality, holistic regiment which may be cost prohibitive for a large dog which eat 4 to 6 cups a day! The likelihood of a small dog causing serious injury to a human being is lowered (but not impossible). Just some of the pluses.

I have two small dogs - both jack russells. They may be small, however, they need the same amount of exercise as a labrador retriever! Love them dearly.

Good luck.
References :

FIRSTTTTTTT

there is such a thing caled teacup yorie pups but its jus that the word teacup isnt the official name
References :