What Is Your Dog's Favorite Toy?

My dog is weird about this matter. We bought him lots of stuff like bones, toys, rubber ducks, but the only thing that he likes is some kind of cluth tied in the form of a bone. He loves it, he just does. If you take it away from him, he'll be jumping around you, trying to reach it and when you throw it away, he goes after it, picks it and hides under the beds, tables, every holes he finds in the house so you don't take it anymore. It's really funny to watch how he runs away from you with the cluth in his mouth so you couldn't take it away from him.