that's called "Coprophagia" latin for dung eater... reason for dogs doing it vary.. some say dogs do it because they're lacking minerals in their diet, or the food they eat has a high fat content, and it tastes good to them... there is stuff you can buy to add to dog food to make the poop taste bad. Who would have ever thought you'd have to add stuff to make it taste bad. Go figure..and to think there's people out there getting paid to try and figure out how to make it taste bad.. wonder if they used taste testers??.hehe. but anyhow, it's more common in puppies and they usually out grow it