How can you stop your dog from eating his feces?

This is a common behavior exhibited in canines. It is called coprophagia. Although the behavior is not generally harmful, it is oftentimes difficult to live with and gives new meaning to dog breath. There is an effective product on the market today that is in the form of a tasty, chewable tablet for dogs. This product makes the stool undesirable for dogs due to the odor of the stool. It comes highly recommended.
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Try feeding him some crushed pineapple, canned pumpkin or spinach.
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The pet store may have a spray that would work to discourage this.