It has been a somewhat slippery winter around here. I was thinking about this last night. I had taken my guide dog out for the last time and was coming back in when someone told me there was a little patch of ice. They said good thing it wasn't black ice. I have heard people describe black ice before and know that it is difficult to see. So, what is black ice? How is it different from other slippery icy sidewalks? What do the icy sidewalks look like? How do you know there is a patch of ice ahead? How do I know? When my foot touches it! I do find my guide dogs get to know it and become more careful with the ice. Thank goodness for that.