Common domestic animals in Middle-earth. The greatest of them all was Huan, the Hound of Valinor.
In our World, Dogs were bred from Wolves, but it's unclear whether this applies in Tolkien's universe. We know that there were Hounds in Valinor (specifically, Huan) when Arda was only a few thousand years old, and it's hard to imagine the Valar urgently breeding Wolf-stock to produce the first Dogs so quickly.
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