THe 'cork' option took me a minute..why on earth would you feed your dog cork?? haa haaaa Now I get it!
I've discovered that nothing sets off Scruff like a good feed of venison. I, too, wasted much time looking for doggy surprise, only to realize it was just gas...... JUST gas..sigh.
That's the only issue he's really had. I feel for owners of dogs with delicate bellies.