Everyone, be aware that our dogs, unlike their wolf cousins, are scavengers first and hunters later. Some dogs do this, most do not. I have a female who does, but only her own. The supplements such as Distaste will stop this behaviour temporarily, but not forever. I think some will do it because the scavenger instinct is so strong. Others may do it because of a lack of nutrition or a mineral/vitamen deficiency.
Disgusting, I know. They lick their bottoms as well, and we seem to accept that more than we do the eating of poo. While most dogs will not eat his/her own turds, no healthy dog will ever turn down a cat turd or a pile of horse poo. It is the scavenger mentality.
MI GSD, I laughed so hard that I nearly woke my wife when I read the nickname "Turd Burglar", as I thought that was a Bob-O original nickname for a wonderful GSD who is long gone from this world. Not her own-Just the ones made by the cat. She was very stealthy about this, and would pick up the litterbox by the handle and carry it to a discreet location-and do it with silence. Ah, but the breath always gave her away!