As the Istari, but it is well known that Gandalf as Olorin traveled around as an elf, and so on. Only during their battle against Sauron were they limited to their human shapes.
I mentioned Felagund. He disguised them yes, but didn't change shape into an animal.
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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