AT ABOUT 5 A.M., my Lab, Junior, and I set up on an island in the Mississippi. After sunrise, I shot a mallard that fell way out, so we started across a wing dam to get it, and 30 yards out, I tripped. I slid off the wall, and the river poured into my waders. The current was so strong it shoved me under. I looked up and saw Junior swimming in circles.