Unfortunetly I have the same problem......I had a litter of 3 puppies and the 2 younger females are eating their own pooh too! It irritates the heck out of me! They will eat their own and each others, they only started doing it since I started feeding them the wet/canned dogfood. It upsets me to have to scold them. My male used to do it too, but he grew out of it. Actually the more you respond and get excited they think I'm playing a game when I chase them to try and stop them. It's weird if you don't acknowledge it they stop and grow out of it? I tried everything from the Vet. but it only works unless you keep giving them the pills and that gets expensive! I even tried "Meat Tenderizer". But so far I noticed you just can't leave them un-attended for long periods of time and when they do go pooh, you have to pick
it up right away! Good Luck