The general opinion is that anyone using the term "teacup" when selling a Yorkie is uninformed and they often use that term to up the cost of a Yorkie that is not substantiated. Do you have a copy of their breeding geniology or a DNA to indicate health issues in the breeding line? The pup is 8 years old - any passed health issues.
Smaller Yorkies are more easily injured, but can be healthy. I would get a through vet check with lab work before getting any smaller pup.
__________________ .  Cali  , and Cali's keeper and staff, Jay No, not a "mini" Yorkie - She loves to motor in her Mini Cooper car |