Why do dogs eat their own shit?

Dogs eating their own poop may be a lack of trace elements, leading to the formation of xenophagy; may be learning from other dogs, puppies see other dogs eating poop, will also learn, thus developing the habit of eating poop; dogs eating poop is a nature, nature leads to the love of eating poop. Dogs with gastrointestinal parasites, diabetes, pancreatitis and other medical conditions may also cause poop eating. If the dog has been punished by the owner before for the problem of pooping, the dog will think that pooping will bring punishment from the owner, so it will eat its own poop to destroy the evidence.