A paper shredder is a great device to have in your home office area. They can shred paper and discs. If your in the habit of leaving it on you might want to reconsider. They can also shred your dogs tail or other body parts depending on the size of your dog.
Dogs and Paper Shredders
Melanies' book "Safe Dog Handbook" is a 'MUST HAVE' for every dog owner. It covers everything from prevention to rescue fist aid and is a treasure trove of information all dog owners need to know.