You're right. More people are injured by bison in Yellowstone than by bears. Usually because they are being stupid. One of the closest I counters I had was in Glacier when we came upon a couple with a small dog and a bear about 25 yards away up on its hind legs, sniffing the air. With four of us, the bear decided the odds were not in his favor and he wandered off. As far as I know, there have been no documented attacks against a group of five or more people. That being said, I would not leave my barking dog in my RV alone in any National Park where there are bears.
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