From what I have read, Yorkies cause fewer allergy/asthma issues than most other dogs (
https://www.google.com/webhp?sourcei...ergies+to+dogs). Yorkies are actually called hypo-allergenic by some.
Allergies leading to asthma rarely get better; they usually get worse. If it was in fact the little gal, you will know soon as your breathing will clear up again after you get most the dander out of the house.
I hope you find a great match for your allergies and your heart soon!!