A dog will eat its own poop for many different reasons: 1) not getting enough nutrients from their current diet 2) the dogs body is not absorbing enough of the foods protein and etc from the first ingestion. 3) if its uncomfortable in its surroundings it will do it to hide their tracks or trace. Best way to get them to stop is to pick up the poop as often as possible, or if you don't have to time to pick it up. I suggest (its going to seem "harsh") fill a spray bottle with a vinegar and water solution, 80% vinegar and 20% water. It will cause the poop to dry up faster and vinegar is a very sharp taste on a dogs tongue.