Coprophagia is the compulsive consumption of feces. The term comes from the Greek words “copros” (feces) and “phagein” (to eat). While the concept is understandably off-putting, coprophagia is surprisingly common in the animal kingdom. In some species it’s a normal, even essential behavior. In others, including dogs and humans, it can signal a behavioral pattern, a medical issue, or simply an inherited instinct that never faded.
Why Some Animals Need to Eat Feces
For rabbits, rats, termites, and many other herbivores, coprophagia isn’t a problem. It’s a survival strategy. Rabbits produce two types of droppings: hard pellets and soft, nutrient-rich cecotropes. These soft feces contain significantly more water, protein, amino acids, and minerals like sodium, potassium, and chloride than hard feces. By re-ingesting them, rabbits extract essential amino acids and vitamins their digestive systems couldn’t fully absorb on the first pass.
This process, sometimes called cecotrophy, is so important that preventing it can actually harm the animal. Studies on rabbits have shown measurable differences in growth and gut health when coprophagia is blocked. For these species, it’s not a quirk but a core part of digestion.
Coprophagia in Dogs
Dogs are by far the most common reason people encounter this term. If your dog eats stool, you’re not alone, and the behavior is more normal than most owners realize. Research has found no consistent link between coprophagia and gastrointestinal disease, nutritional deficiency, or compulsive disorder in dogs. It doesn’t correlate with sex, age, diet, or how easily the dog was house-trained.
The strongest predictor is surprisingly simple: dogs described by their owners as “greedy eaters” are far more likely to eat feces. Dogs in multi-dog households are also more prone to the behavior, likely because there’s more stool available. One compelling theory traces this back to wolves. Ancestral wolves may have consumed fresh feces near their dens to eliminate parasite eggs before they became infectious, which typically takes about two days. The instinct to quickly remove stool may have carried forward into domestic dogs, with greedy eating being a common wolf trait that reinforces the behavior.
That said, certain medical conditions can contribute. Exocrine pancreatic insufficiency, a condition where the pancreas doesn’t produce enough digestive enzymes, has been identified as a predisposing cause. Nursing mothers also commonly eat their puppies’ feces as an instinctive hygiene and protection behavior, reducing scents that could attract predators. Stress plays a role too. Dogs kept in isolation, confined spaces, or restrictive environments are more likely to develop the habit.
Health Risks of Eating Feces
The biggest concern with coprophagia isn’t the behavior itself but what feces can carry. Stool is a vehicle for intestinal parasites and bacteria. Research on parasite transmission has identified roundworm eggs, whipworm eggs, pinworm eggs, and Giardia cysts in environmental fecal samples. Dogs that eat feces from other animals can pick up parasites that aren’t typical to their species, creating additional and sometimes harder-to-diagnose health problems.
For dogs, the practical risk depends on whose stool they’re eating. A healthy dog eating its own fresh stool faces relatively low risk. A dog eating feces from unknown animals, wildlife, or dogs with untreated parasites faces a much higher chance of infection.
How to Stop Dogs From Eating Stool
The most reliable approach is the simplest: prevent access. Clean up your yard thoroughly and supervise your dog during outdoor time. If you track when your dog typically has bowel movements, you can be present right after elimination, call the dog to you, reward a sit command with a treat, and pick up the stool before walking away. Over time, the pattern of “eliminate, come to owner, get treat” can replace the impulse to turn around and eat.
If your dog starts sniffing or approaching a stool, interrupt the behavior with a firm verbal cue or a quick leash correction. Head halters make this particularly effective. For dogs that eat stool when you’re not nearby, remote spray collars can interrupt the behavior without the dog associating the correction with you directly. Consistency matters here. Every time the dog mouths a stool without interruption, the habit reinforces itself.
Dietary changes can also help. Switching to a more digestible food or a different protein source may reduce the appeal of stool. Dogs on calorie-restricted diets sometimes do better with high-fiber formulas that increase fullness. Adding digestive enzyme supplements (meat tenderizer is one common form) to your dog’s food may improve protein digestion and make the resulting stool less appealing. If you’re using these with dry food, moisten it first and let the supplement sit for 10 to 15 minutes before feeding. Other home remedies like adding papaya, yogurt, cottage cheese, or breath mints to food have been suggested but never proven effective.
Coprophagia in Humans
In humans, coprophagia is rare and almost always associated with an underlying psychiatric or neurological condition. It’s classified as a form of pica, the broader term for compulsively eating non-food substances. Cases have been documented in people with dementia, severe intellectual disability, and certain psychotic disorders. Unlike in animals, there is no nutritional or evolutionary logic to the behavior in humans.
The health risks for humans are significant. Feces can transmit a wide range of intestinal parasites, bacteria, and viruses. Treatment focuses on managing the underlying condition rather than the coprophagia itself, since the behavior is typically a symptom rather than a standalone diagnosis.