I recall reading that adding raw zucchini to the dog's diet might help with this problem.
Here it is: >From " The Veterinarian's Guide to Natural Remedies for Dogs" - Safe and Effective alternative treatments and healing techniques from the Nation's Top Holistic Veterinarians" (1999) edited by Martin Zucker, pp 140 -142, under the heading "Stool eating", Nancy Scanlan, DVM, recommends RAW ZUCCHINI. Poignantly she writes" I have no idea why it works, but it frequently helps." The author surmises that poop eating is often caused by a lack of digestive enzymes or hydrochloric acid, genetic flaws (huh??), or poor diet. Her other suggestions are: a) digestive enzymes b) adding meat tenderiser to the food Worth giving the raw zucchini a try? BTW, the book also lists other vets suggestions such as adding trace minerals ( e.g. such as supplementing the diet with kelp). And ALL of the vets recommend adding digestive enzymes. Good luck! Michaela, Harvey & Rupert Devon/UK PS: It's a good book, I'd highly recommend it.