Coprophagia is the medical term for eating feces, and in dogs, it’s surprisingly common. While the behavior is deeply off-putting to most owners, it ranges from completely normal (in puppies and nursing mothers) to a potential sign of an underlying health problem, depending on the dog’s age and circumstances.
Types of Coprophagia
Not all stool eating is the same. Dogs may eat their own feces, the feces of other dogs, or the feces of entirely different species like cats, deer, or horses. Each pattern can point to different motivations. A dog that raids the cat’s litter box, for example, is likely attracted to the higher protein content of cat food, while a dog that consistently eats its own stools may be dealing with a digestive issue that leaves undigested nutrients behind.
Research published in Veterinary Medicine and Science found that some dogs eat only their own stools, others eat only stools from other dogs, and many do both. The distinction matters when trying to figure out the cause and choose the right approach to stopping it.
When Stool Eating Is Normal
At certain stages of life, coprophagia is not only common but biologically useful. Nursing mothers routinely lick their puppies clean and consume their waste. This keeps the nesting area sanitary and, in wild ancestors, would have helped prevent the smell of feces from attracting predators. Even mothers of large litters rarely experience stomach upset or health problems from this behavior.
Puppies often pick up the habit as well, possibly by imitating their mother or as an instinctive drive that supports healthy gut development. Many puppies grow out of it on their own as they mature, though some carry it into adulthood as an ingrained habit that becomes harder to break over time.
Medical Causes to Rule Out
When an adult dog suddenly starts eating feces, or does so persistently, the first step is looking for a medical explanation. Any condition that causes poor digestion or increased appetite can drive the behavior, because partially digested food in stool still smells appealing to a dog.
Exocrine pancreatic insufficiency (EPI) is one well-documented example. Dogs with EPI don’t produce enough digestive enzymes, so food passes through their system without being fully broken down. A study in Veterinary Sciences found that 17% of dogs diagnosed with EPI displayed coprophagia. The connection is straightforward: when the pancreas isn’t doing its job, the stool is packed with undigested fats and proteins that a hungry dog finds hard to ignore.
Other medical conditions that can contribute include intestinal parasites, which steal nutrients before the dog can absorb them; malabsorption disorders that leave calories in the stool; and any illness that significantly increases appetite. Thyroid problems, diabetes, and certain medications (particularly steroids) can all ramp up hunger enough to trigger scavenging behavior, including stool eating.
If your dog starts eating feces, a veterinary exam focused on digestion and appetite is a reasonable first step. Testing for enzyme deficiencies, parasites, and nutrient absorption problems can confirm or rule out a physical cause.
Behavioral and Environmental Triggers
When medical causes are ruled out, the explanation is usually behavioral. Dogs are opportunistic scavengers by nature, and some are simply more food-motivated than others. Research has noted that dogs described as “greedy eaters” are more likely to eat stools, suggesting the behavior may just be an extension of a strong food drive.
Environmental factors play a role too. Dogs that spend long hours in confined spaces with their own waste, such as those kept in small kennels or crates for extended periods, are more likely to develop the habit. Boredom and lack of mental stimulation can push dogs toward eating things they otherwise wouldn’t. Anxiety, particularly separation anxiety, has also been linked to coprophagia, though this connection is less well studied.
Some dogs learn the behavior from watching other dogs. In multi-dog households, if one dog eats stools, others may start copying. And in some cases, dogs that have been harshly punished for having accidents indoors may eat their own feces to “hide the evidence,” creating a cycle that’s difficult to interrupt.
Health Risks of Eating Feces
A dog eating its own fresh stool faces relatively low risk, since any parasites or bacteria present are already in its system. The picture changes with feces from other animals. Stool from other dogs, wildlife, or livestock can carry intestinal parasites like roundworms, hookworms, whipworms, Giardia, and Coccidia. Bacterial infections from organisms like Salmonella and Campylobacter are also possible, and some of these can spread to humans in the household through licking or close contact.
Dogs that eat the feces of animals treated with medications or that have consumed toxic substances can also be exposed to those chemicals secondhand. Horse manure, for example, sometimes contains deworming drugs that can be harmful to dogs in sufficient quantities.
How to Reduce or Stop the Behavior
The most effective strategy depends on the underlying cause. If a medical condition is driving the behavior, treating that condition often resolves the coprophagia. Dogs with EPI, for instance, typically improve once they’re started on enzyme supplements that help them digest food properly.
For behaviorally driven coprophagia, management and training work better than punishment. The core strategies are:
- Immediate cleanup: Pick up stools from your yard right away. If the stool isn’t there, the dog can’t eat it. This is the single most reliable prevention method.
- Supervised walks: Keep your dog on a leash in areas where other animals’ feces might be present, and redirect their attention when they show interest.
- A solid “leave it” command: Training a reliable “leave it” gives you a tool to interrupt the behavior in the moment.
- Dietary review: Make sure your dog is getting enough calories and nutrients from a complete, balanced diet. Switching to a higher-quality or more digestible food sometimes reduces the appeal of stool.
- Environmental enrichment: Puzzle feeders, longer walks, and more playtime address the boredom component.
Commercial taste-deterrent products, which are added to a dog’s food to make the resulting stool taste unpleasant, are widely available. Their effectiveness varies considerably from dog to dog, and research has not established strong success rates for these products overall. They may work as one piece of a broader strategy but are unlikely to solve the problem alone, especially for dogs with strong food motivation.
Coprophagia can be frustrating to deal with, but in most cases it’s manageable once you identify what’s behind it. A vet visit to check for digestive problems, combined with consistent cleanup and basic training, resolves the behavior for the majority of dogs.