In a story from June 2009, an eight-year old mixed breed dog required over 100 sutures and lost part of her tongue due to a paper shredder accident. In this case, her owners were home and took her to the vet immediately. A dog left alone may not have been so lucky. News stories from 2006 and 2007 also detail the paper shredder dangers for pets and small children.
It's not worth the risk. To be safe, turn off the auto-run setting. Better yet, unplug and store the shredder out of reach.
Photo: Micky the Puppy © makuneros on Flickr