Some pets can't help but vacuum up anything they get their mouth on. Cats are notorious for ingesting strings, tinsel, and Easter Grass. No matter what the culprit, the end result might be abdominal surgery. Signs of obstruction include severe lethargy, abdominal pain, vomiting, or even a complete inability to keep down food and water. Call the hospital immediately if you notice any combination of these signs -- 610.323.9454.