I see your point but Sauron also thought he used Shelob but he didn't control her, so my point remains valid if it is seen that Smaug is his own master. Using a creature like that can be unpredictable.
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“I wish it need not have happened in my time," said Frodo.
"So do I," said Gandalf, "and so do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given us.”
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