Seeing Eye

This morning I saw a seeing-eye dog bringing a woman across Winter Street in Downtown Crossing. It's mostly foot traffic there, but while they were crossing a slow-moving Poland Spring water truck happened to be coming down the street. The dog noticed it when they were half-way across the street. He hesitated for a second, just long enough to make it clear he was deciding whether to continue along or go back. Then he started backing up and brought the woman back to the sidewalk.