Boxer Dog v.s. Mother Bear: Stand off

On a jog up to Crystal Falls in Coquitlam B.C , Canada my Boxer dog and I came across a bear and 2 cubs. This was right by the falls. Behind me was a dead end, in front was a Mom bear and her two cubs, and the only way out. Got out alive, win for me :) The bear made 2 bluff charges one toward my dog which I found interesting as my boxer got meters away before the bear moved towards him making me ponder.. what is greater strength or agility? 2nd was toward us both near the end, but it is clear the bear was f