Keep in mind, unless you correct them "in the act" they really have no clue that they have done something wrong, or more to the point "what they did wrong"…. shredding is pretty natural to a Basenji
I even noticed that Nala has "carved" out her own little trail of mud - she races the cars as they drive up the road. That's where she's getting muddy (there is still some run-off from melting snow). Maybe little tiny paver stones…hee hee