I;m so sorry you have to go through that...a few months ago i found out Mojo has a slight elongated soft pallate, in his case it is not required a surgery (Thank God!!)
All i really know about it is that it is more common in "flat" faced dogs like bulldogs and pugs for example and i never found any info about this in yorkies......here are a few links....
http://www.pugman.com/Pug%20Informat...t%20Palate.htm http://www.bullwrinkle.com/index.htm....htm~indexmain http://www.barkbytes.com/medical/med0026.htm
Elongated Soft Palate
by Jennie Bullock
One of the the most common forms of airway obstruction in Brachycephalic (short muzzled) breeds is due to an elongated soft palate. The soft palate is an extension of the hard palate which forms the roof of the mouth. The purpose of the soft palate is to serve as a mobile flap preventing food and water from entering the nasal passages during swallowing. A soft palate that is elongated will either hang in front of the airway or will fall into the larynx during inhalation.
Dogs affected by chronic airway obstruction (CAO) tend to breathe rather noisily when excited. Mouth breathing, snoring and snorting are characteristics of this condition. These characteristics become even more pronounced when the dog is hot or during periods of exercise. The dogs frequently gag in an attempt to clear their airway and occasionally bring up foam and saliva while eating or drinking. The harder the dog breathes, the greater the swelling and elongation of the soft palate.
Most often an elongated soft palate is difficult to positively confirm other than while the dog is under general anesthesia, surgical correction is usually done at the same time.
Best of luck!