It probably was Teddy. If he had any way to get at the cat. But I don't think he'd have gone in to Gryffindor Tower to get it, the cat would've had to get out. Or someone in Gryffindor would've had to get it out for him, but I don't know who'd do that to your sister.
Even the Slytherins try to keep our pets away from Teddy unless we're there to keep an eye on things. It's easier for the girls, because he can't get into our dorm.
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It probably was Teddy. If he had any way to get at the cat. But I don't think he'd have gone in to Gryffindor Tower to get it, the cat would've had to get out. Or someone in Gryffindor would've had to get it out for him, but I don't know who'd do that to your sister.
Even the Slytherins try to keep our pets away from Teddy unless we're there to keep an eye on things. It's easier for the girls, because he can't get into our dorm.