Awe, see he's being a sweetheart and giving you options as to what you would prefer in the apartment - dirt or sand. Sounds like a true gentleman. Hehehe
LOL! Yes, a true gentleman sweetheart... And in the winter, a big snow pile. Yes, he does the same thing with snow: climb up, slide down...rinse and repeat.
*Sigh*
Well, when and if I ever come into major abundance, we will have a mansion with many climate-controlled rooms, each with a big pile of snow/sand/dirt, and Mateo can spend his days wandering between these magical places...
What more could a silly dogue ask for?