Eating poop dates back to when wild dogs scavenged for food and lived in packs. These days, domestic dogs may do it for attention or because of anxiety but it can be an indication of disease in some cases.

The first theory is connected with intestinal parasites. Dogs get infected with these by eating the waste of an infected dog but often the stool needs to be a few days old before the eggs in it can infect a new host.

The second theory is that ancient dogs were essentially scavengers and lived off whatever they could get their paws on. In order to survive, they had to evolve to not be that picky about what they ate.

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