Dog Leash Umbrella

Why oh why would you ever need this?

I don’t understand how this works. The umbrella rod is straight and the umbrella canopy is perpendicular to the rod.

The dog would walk out in front of you, tilting the rod at an angle, which would angle the canopy in the same amount. That would cause the canopy to more or less scoop the dog’s butt while he walks and leave his head exposed.