From Petplace.com
Dogs and cats commonly eat things that they shouldn't. The problem is that many items can't be digested or pass through the intestine causing a "Foreign Body". An indigestible object can become lodged in the stomach or intestines that may require surgery to remove. Untreated, ingestion of these types of items can be fatal.
Veterinary Pet Insurance (VPI), the nation's oldest and largest provider of pet health insurance, complied a list of most common items surgically removed from pets.
Do you know what is #1? It is the sock. This is most common in the dog. I'll tell you more about cats in a second.
Here is the list:
Top 10 Surgically Removed Items From Pets
1. Socks
2. Underwear
3. Panty Hose
4. Rocks
5. Balls
6. Chew Toys
7. Corn Cobs
8. Bones
9. Hair Ties/Ribbons
10. Sticks
In my experience, the most common items surgically removed from cats are ribbon, string, tread, baby bottle nipples, and toys.


Comments: 20
As for cats... toy mice, silk flowers, the plastic rings from around the cap of the milk jug... and dental floss is a really bad one...
Thanks, Margieanne! Good info here.