Andrew had better faith in people generally. He didn't reckon cats came to much harm around Hogwarts, lots of people kept them, and Mrs Norris was terrifying. Cats had respect, as far as he was concerned.
He adjusted his glasses and headed towards the Gryffindor boys' dormitory. When he got there he looked high and low -- he'd had cats as a kid, and he knew well enough they liked to sit up high.
"Ch-ch-ch," he crooned quietly, crouching to look under the beds. Gross was his most prevalent thought; Gryffindor boys weren't particularly tidy.