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Rawhides don't disolve so this may be your problem. Rawhides make great chew toys but you have to take them away when they get small enough to be swallowed. Some pieces are just too big to pass.
If I were you, I would see the vet tomorrow to have an x-ray (not terribly expensive) to rule this out. They might be able to retrieve a fragment before it does damage and causes a blockage.
Let me know if you still have questions about this.
Sorry that I confused you. Rawhides are digestible in the fact that they can be chewed. BUT, some dogs stop chewing when the pieces get small and they just swallow them. Once they hit the intestestines, they are not further digested.