Enchilila:
Coproban is completely safe, and you are right...it is really the MSM that more or less discourages the dog from eating their (or others) poops.
There are a lot of reasons why a dog will eat poop (poop eating is technically called coprophagany. In fact, it is commonly thought that the real reason (dating back a very long time) for dogs eating poop stems from the fact that dogs have evolved from wolves (as we all know)...as wolves that were not particularly scared of humans moved closer to human settlements, they began eating our garbage (and our poop). The are more or less scavengers.
There are also many reasons why YOUR dog will eat poop, including stress, hormonal imbalance, and glandular issues.
Coproban is a great product...another one I've had great results with is called
"SEP" or "Stop Eating Poop" (gotta love that name, eh?). The major effective ingredient in SEP is glutamic acid which ultimately makes the dog's poop taste bitter and will get them to stop eating poop.
