I walked Bartleby to a park today, and there was a ledge maybe 5 feet high between where the grass started (it was on a hill) and where the sidewalk was. Bartleby was walking along the ledge on leash, I was right next to him, and didn't perceive that he'd be dumb enough to jump off the ledge onto the concrete. I was wrong. He ran a little ahead of me and jumped for the sidewalk. He didn't yelp out at all but I made a loud shout in fear he was going to break his bones. Mid-air he seemed to…