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The term of eating poops is called "coprophagia", just google this you'll find many useful info. It's most likely a behaviorial problem rather than a nutrient deficiency, because most dog chows today contain sufficient nutrients.
Male dogs that are not neutered or neutered as adult rather than as puppy tend to do this, it's a manifestation of being territorial. The cure: neuter the dog or add a product called "Forbid" to the dog chow. Another way is to add meat tenderizer to the dog food.
Train the dog to sit after he poops and if he does sit, reward him with a small treat. Obedience training could also help as well.