My one year old tzu-shih/poodle cross has recently started to do this when she poohs in the garden so I have to watch and collect immediately. I have researched the web and, as per previously answered, pineapple is recommended. So not pleasant but apparently normal and not damaging. One consolation is she does not eat other poohs left by inconsiderate owners who don't clean up after their dogs when out walking. My Lucy is a problem eater and I have to cut out all biscuits for her to eat her food (presently on Pedigree chicken in gravy, well for this week anyway). I have tried all dried food and she will eat this for a short time then stops. Difficult, as they say when you change the diet do it gradually. Anyway, apart from this she is fit, healthy and happy. Digusting habit but at the end of the day they clean their own bums (and more for ***, slurp, slurp yuck). Mine is gradually responding to "LEAVE" and we are making progress.