As for why do Yorkies get it so much, I don't know. It is something to do with genetics coupled with bad breeding practices.
Some symptoms are:
Seizures
Head Pressing (pressing head against a solid object)
Circling
Shaking
Vomiting and Diarrhea
Itching
Excessive appetite and inappetance
Lethargy and Depression
Pica (bizarre cravings for unnatural foods...rocks, sticks...per Dr. Tobias 1993)
Urinary Problems or frequent UTIs
Anesthesia and medicine sensitivity
This is by no means an exhaustive list and most of these symptoms are symptoms of other diseases also.
You can get a bile acid test if you are concerned.
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