I didn't know about only frightened dogs doing the poop cover move. Not sure I believe you, Pdawg, but you have much more experience than moi. I suppose you're right and it's some kind of neurosis sign/sign of abuse.
Pacco used to do a little back leg kick maneuver that was of little use but that I took as some kind of instinctual fillip. Or flip, but he wasn't a good little **** flipper. He was better at this in New Mexico, land of sand yards, than in Humboldt County, land of verdant growth.. but it was more like our human wave of the hand in passing, not serious poo pailing. But I dunno if he was mistreated before me, as I got him at about age 6 or 7, found walking down the highway. At any rate, I was his person and he didn't fear me.