It's simple really. Sauron's dumb. Over the course of the books, he does many laughable things, such as sending an army one by one to their deaths and overestimating the ring.
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"And forth went Morgoth, and he was halted by the elves. Then went Sauron, who was stopped by a dog and then aged men. Finally, there came the Witch-King, who destroyed Arnor, but nobody seems to remember that."
-A History of Villains
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