Poop eating is a trait often learned by a puppy from a mother dog. It is innate den behavior for a Momma dog to clean up after the puppies in the den to keep the den clean. Puppies see Momma do it, so they do it. Many dogs feel their crate is their "den" and will try to keep it clean. One way to break this behavior that my Vet told me,is to feed the dog (and all dog in the home) a tablespoon of canned pineapple with each of their meals. The pineapple reacts with gastric juices to produce a very nasty taste and can discourage this behavior. You may have to feed it every meal for a week or more to be effective. I foster dogs for rescue and use this method frequently. Good Luck!