Welcome to YT.
It could be bile, but eating right before bed and as soon as she gets up should help. One reason that liver compromised dogs don't like to eat sometimes is the food makes them feel sick (the toxins build up in their system). But then, Yorkies are notorious for being weird/picky about food.
What supplements is she on?
Why hasn't the shunt been surgically corrected? When an operable shunt isn't closed, more shunts can occur causing an even bigger problem.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |