It's been all over the news here in BC where it happened. I think that is just awesome that dog stepped in to take on that cougar and thereby saving that boy's life. I almost think that even a little yappy dog like my dog Casey that I used to have would have stepped in and went berserk at the sight of a cougar but probably would have been swallowed up pretty quickly. Either that or she would have been enough of a distraction to give someone a chance a flee.
There's so many cougars here on Vancouver Island and I am so scared of ever encountering one but I probably won't b/c I live in a fairly populated area and generally don't do much trekking in the outdoors but you never know b/c their habitat is huge.