Mystery Solved?

Remember when Hunter was hurt while running in the fog?  I had not returned to the "scene of the crime" until yesterday.  The boys and I went for a nice long stroll and ended up in the same area.  Scanning the ground showed me probably what I was looking for.  My guess is that one of those red fire hydrants were what Hunter crashed into.  Trees might be the guilty parties, but I think the red fixtures in the middle of the grassy areas are a danger for running dogs.I shudder to think of what it would feel like running into something like that in the fog.