Dogs may eat dirt to compensate for certain nutrient deficiencies in their diet. The soil may contain minerals or trace elements that their body needs.
Some dogs eat non-food stuff like dirt. Medical conditions, boredom, worry, and compulsive activity can trigger pica.
Eating dirt may be a response to gastrointestinal distress. Dogs may eat grass, mud, or other things to feel better.
Digging and eating dirt may provide sensory stimulation for dogs. Dirt intrigues dogs.
Some dogs may eat dirt out of habit or as a result of boredom or lack of mental or physical stimulation. It can become a learned behavior or a way to occupy themselves.