a sly dog

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a sly dog

Someone who, through cunning, devious, or dishonest means, achieves a fortuitous outcome. What a sly dog, he managed to get a copy of the test so he could memorize the answers ahead of time!
See also: dog, sly
References in classic literature ?
You are a sly dog, Sancho," said Don Quixote; "i' faith, you have no want of memory when you choose to remember.