hi there and welcome to YT. I think It's great that your looking into the Yorkie Breed first before making any final decisions.
My son has severe allergies, and he does great with our Yorkie
. My kid who is 15 needs shots, inhalers, and meds. Yorkies do not have a undercoat and are considered a hypo allergenic breed.
If you buy a yorkie Pup from a reputable breeder thaen chances are slim that you will run into any major health issues. DO NOT let any of those health issues stir you away from you the most wonderful breed there is! In fact all dogs have a chance of getting any health problems . ANy animal . Not just in the Yorkie. If you start reading up on any breed you will fin this out to be true.
my Yorkie just turned a year old a coulpe of weeks ago . I got her at 9 weeks , which i should have waited until 12weeks, but she did fine. Suzi is her name , and she has brought such great into our lives . It has been the best choice we have made bringing her home
I've never regretted it!