I was careless a couple of summers ago and my chin chewed on the cord of a fan I had sitting to close to her cage. The wire was exposed in several locations, but my chin was fine...thank goodness. I have since learned not to have anything even remotely close to her cage and pen. You just can't be too careful. If your chin runs around loose, not in a pen, then get down on his level and make sure there is nothing harmful for him to come in contact with, since they will chew on anything.