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This is a recent development for Ruckus. I don't know where he learned it, but I hate it.
it's an instinctual reflex; here's something I found on Vetstreet.com:
In the wild, canines such as wolves, dingoes and foxes may kick the ground after elimination for sanitary reasons. They are simply covering up the mess. But the behavior is also a way to mark territory. All dogs have glands in their feet that secrete pheromones, and a couple of backward scratches into the earth releases those chemicals.