JMO but if the really small yorkie comes from a breeder that is breeding to the standard and is striving to produce healthy dogs, but occasionally gets a small puppy. And that breeder holds it longer and does necessary tests I wouldn't worry so much about the health of the puppy.
I would not buy a tiny yorkie from someone who's main focus in their breeding program is getting tiny yorkies. These breeders tend to overlook the important things imo.
This being said if you do end up with a healthy smaller yorkie the size still gives you much more to worry about. Blood sugar, them being stepped on or jumping off of the couch could cause major injuy or death. If they get sick at all it is always a trip to the vet because of risk of dehydradion. It is more dangeous to spay or neuter or have a smaller yorkie put under for any reason, however having a small female get pregnant is an even greater danger. Health problems are out there for all sizes of yorkies but with a small one even if it is prefectly healthy you still have to take extra precautions to keep it safe in order for it to live a long healthy life.
__________________ My  belongs to Copper and Maddie Mae RIP Sweet Rocky Mommy misses you |