PINEAPPLE! If you feed a piece of pineapple several times a day consistently I promise that you will stop the poop eating. But the key is persistence. You must also make sure that you are feeding a high quality dog food. If the food is high in grains it comes out the other end like a nice warm loaf of bread
A while back there was a thread all about poop eaters and it has really great information about how the pineapple works the same way as Forbid my adding the fermenting agent to make the poop undesirable.
I will see if I can find the thread and post it here. It kind of turned into a Poop Eaters Anonymous club