[anonymously]

Another excerpt from the ASPCA article (link in previous post)

What NOT to Do
Do not rub your dog’s nose in feces. This procedure won’t fix the problem and might make your dog frightened of you.
Do not physically punish your dog for eating feces. Hitting him with a newspaper or spanking him probably won’t stop him from eating feces, and it might cause more serious problems, such as fear or aggression.