I do not know if Huan was a Maia or not, but he was in service of Oromë, who indeed gave him away to one of the sons of Feanor.
I think all animals in service of the Valar could speak or understand the tongues of humanoid races. Huan was permitted to speak three times and afterwards he would face his doom. The greater eagles in the service of Manwe had the ability of speech too... even Gwaihir and his eagles in the third age could speak to Bilbo, Gandalf and the dwarves in the Westron-tongue.
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'You?' cried Frodo.
'Yes, I, Gandalf the Grey,' said the wizard solemnly. 'There are many powers in the world, for good or for evil. Some are greater than I am. Against some I have not yet been measured. But my time is coming.'
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