Yorkies are generally tough little dogs, but the breed does sometimes experience certain health disorders. Congenital liver shunts, hypothyroidism, eye irratations and renal displaysia are the main problems facing the breed today.
My little Trixie has patella luxation, and some yorkies get premature dental disease and some puppies are born with open fontanels.
Be very careful when buying small dogs. Make sure you know where, how and who bred the dog.
Generally speaking, yourkies will live 12-17 years, with 15 being about average.