Mine have done this before and I purchased the big container of Adolfs Meat Tenderizer with the little top that you can sprinkle it on your food. I sprinkle it on the dogs food and it takes about a week of consistanly doing this and it has worked for me every time. I have even done it with puppies. I dont know why they would EVER want to eat poop, but as you can see in these posts, they think its dessert or something. EWWW!!
Try it and see if it works. Deter did not work for mine. Good Luck!