How to care for my pet unicorn?

You need to feed him some purple marijuana, then keep him outdoors in a fenced off area, and keep an eye on it in case it tries to sneak off and deal drugs, which is always a negative to owning unicorns. In case of any other worries, contact Hagrid on Hagrid+aragog_4_life@mugglenet.com for free advice on how to look after a unicorn from an acclaimed Care of Magical Creatures Teacher at Hogwarts School of Witchcraft and Wizardry. Hope I have helped, Good Luck