Proceed Slowly, with Caution, on this Hiawatha Street

Julie and I took Cooper for a walk after work last night and this Hiawatha yard sign caught my eye.  I found it very funny, but at the same time I bet it's effective, don't you?  I also noticed that with all the dogs being walked in this weather, I didn't notice ANY pooch presents left in this yard.  Gee, I wonder why...