Harry Potter and the Carnivorous Pony

Harry Potter and his friends encounter a mysterious beast living inside Hogwarts. On the way to discovering the creature's identity, they encounter a one-legged friend, a large purple-and-yellow feathered hat, and mass destruction in the Great Hall.

For IcamaneHatake's Harry Potter and the Highly Unnecessary yet Mildly Amusing Rejected Title Contest.
3,595 words.

Horseless Carriages... with Horses
What are those things? Why does no one believe Harry? Is he just going insane?
Losing Limbs
Flobberworms and rabbits and legless friends... ?
Hagrid's Atrocious Hat
A yellow and purple bird on a rock? Not exactly.
Fresh Meat
Penelope's dinner is blond.