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  I would just watch him closely.  A corn cob can cause bowel blockage if he swallowed large pieces.  Just keep watch to make sure he poops regularly. If he us unable to poop for more than a day,then he should see the vet.Signs seen with intestinal obstruction may include: vomiting or dry heaves, diarrhea (or straining), anorexia, painful abdomen, lethargy.  Please keep us posted.
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