The bile acid test is a blood test right before a meal and then another one two hours after a meal.
It does sound like more of a stomacho problem than a liver problem with the thickened stomach lining but I think the bile acid test should be done on all Yorkies (especially those with questionable breeders) as a precaution anyway, so I would do it.
What are his lipase and amylase levels?
Have they thought about doing an ultrasound?
Have they ruled out pancreatitis?
It is strange that it is vomiting only and not diarrhea.
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