It is the weekend and Tues. is the soonest they can get him in. He has not vomited at any point. He had an ultrasound yesterday that showed a blockage but they couldn't tell if it was a tumor or foreign object. He is old, blind and deaf, so the odds are small that he ate something. Possibly a tumor. The internal specialist said my dog can make it til Tues, may be a partial blockage.