Sauron did nothing to entice Smaug to help him when he was in Dol Guldur. Would/could he have when he was in Mordor? And Smaug didn't know about the Ring. If he had killed Bilbo, perhaps the corpse would have just lain there. Smaug might even have temporarily discombobulated the Nazgul if they came to get it.
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A Gandalf-uncloaking-free zone.
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