Interesting list from the Petplace.com of things that are most commonly removed from pets via surgery. These indigestible items can become lodged in their stomach or intestine requiring the surgery.
The number one item on the list surprised me, as my pets play with them all the time.
Top 10 Surgically Removed Items
3. Panty Hose
6. Chew Toys
7. Corn Cobs
9. Hair Ties/Ribbons