On a family camping trip when I was a child, we spent a couple of nights at Yellowstone. The last night as my dad & I were starting to breakdown the camp in prepartion for leaving early the next morning a bear walked right through our campsite, between the two of us
My dog was in the tent with my mom, who quickly held the dogs mouth so she wouldn't bark and we watched it amble off into the sunset!! Something I will never forget, I was probably about 12 years old (give a take a year).
Your son will have some stories to tell for sure - glad he didn't meet the bear up close and personal!!