Why does a dog or puppy eat its own feces and the feces of other dogs and how to deal with it

Eating one's own feces or coprophagia is common in many animal species. coprophagia is, to one degree or another, inherent in all mammals. In the struggle for survival, the body has adapted to extract useful substances from everything that is possible, including from its own feces, which always contains undigested food particles, enzymes and vitamins. A modern puppy absolutely does not need this habit, it has long since become obsolete. Moreover, eating excrement by a puppy can pose a threat to his health, and therefore, this habit must be quickly eliminated.