Quote Originally Posted by kidzdoc
However, my resident dog has now been vomiting yellowish frothy bile for 12 hours. He has no belly pain, is lying around looking depressed but not really ill, will drink water, but yakks it up later. I don't suspect obstruction.

Anytime a dog can't keep down even water, they need an immediate trip to the vet. Dehydration can do permanent organ damage or even become fatal in a hurry. Those symptoms could mean any number of things. They are the exact symptoms one of my dogs displayed when she had pancreatitis.