That could just make it easier for me to trick you if I were a wolf, you know.

But in any case, if you were a wolf, you'd know anyway, and if you're a sheep, either I'm a sheep and you could use my input, or I'm a wolf and you could prove it by telling another sheep your suspicions and having them proved when a wolf targets you for suspecting him. But in that case you still wouldn't win, so it's best not to overtly suspect anyone without good reason, really.