This happened to my Standard Poodle Beau-tie http://dogoftheday.com/archive/2007/March/20.html a few years ago. It turned out to be the smell of a Coyote that set him off. It is the only smell that totally freaks him out. When we asked the breeder about it she said that when he was a puppy, some Coyotes attach her dogs pens. Nothing happened to the dogs, but I'm sure he is remembering that fear. Your dog probably smelled something wild and got upset like mine. The good news is that after a few years he can smell them (Coyotes), but does not totally freak out now.
Good luck with Koko.
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