"It was a c-cat hair! M-Millicent Bulstrode m-must have a cat! And the p-potion isn't supposed to be used for animal transformations!"
—The Polyjuice potion turned Hermione Granger into a part-cat[src]

Cat hair is hair from a cat that may be used in some potions. It is kept with other potion ingredients in the Potions Classroom at Hogwarts School of Witchcraft and Wizardry.[1]

Millicents cat

Hermione partially transformed into Millicent Bulstrode's cat after accidentally adding the cat's hair to her Polyjuice Potion


In the 1992-1993 school year, Hermione Granger got some hair off of Millicent Bulstrode in the Duelling Club. She needed it to make Polyjuice Potion over the holidays. Harry Potter would become Vincent Crabbe, Ronald Weasley would become Gregory Goyle, and Hermione would become Millicent Bulstrode, in order to interrogate Draco Malfoy and learn if he was the heir of Salazar Slytherin. Unfortunately, the hair that Hermione pulled off of Millicent's robes was from her cat. Hermione then became a humanoid ginger cat and was sent to the Hospital Wing, leaving Harry and Ron to finish the job.[2]


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