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Millicent Bulstrode's cat

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Millicents cat

Hermione transformed into the cat after accidentally adding the cat's hair to her polyjuice potion

This cat was most likely a pet of a Hogwarts student. Its owner took it to Hogwarts in 1992. The cat's fur is black. In 1992, Hermione Granger plucked a small hair of the cat from Millicent Bulstrode's robes, thinking it was hers. She added the cat's hair to the Polyjuice Potion she was brewing, which produced catastrophic results after she drank it.

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