re: Your request for a pet marmoset
Dear Miss Tetley,
Thank you for your letter. I can readily understand that a known animal lover such as yourself would love to bring a pet marmoset.
However, we must think of your dormitory-friends as well. Therefore I regret to inform you that the only animals allowed are a cat, an owl, or a very well-behaved dog.
Given the phobia of one of your roommates, toads and rats are unfortunately out of the question as well.
We look forward to seeing you soonest, Minerva McGonagall Deputy Headmistress of Hogwarts School for Witchcraft and Wizardry