[Spy Dog]

I'd just check-fold against an unknown. Ideally, we'd like a fold if we bet because we can't really fire again on the river with such a weak hand. However, the hands he called with on the flop are likely to call or raise the turn, with the exception of 5x. So, betting the turn is a fairly thin value bet that is quickly negated on the river because we will have a tough time making a good decision there (unless we hit a Ten).