How to Stop a Dog From Eating Feces
Learn how to stop a dog from eating feces with science-backed strategies. Discover why coprophagia happens, evolutionary roots, and proven solutions.
Quick Answer: How to Stop a Dog From Eating Feces
The most effective way to stop a dog from eating feces (coprophagia) combines immediate environmental management with positive reinforcement training. Pick up all feces within 60 seconds of elimination, feed a complete and balanced AAFCO-approved diet, and reward your dog with a high-value treat (such as freeze-dried liver or chicken) immediately after they eliminate and move away from the spot. For persistent cases, commercially available coprophagia deterrents containing Yucca schidigera extract or digestive enzymes can make feces taste unappealing. According to a landmark study by Dr. Benjamin Hart at UC Davis, 92% of coprophagic dogs prefer fresh feces (less than 24 hours old), making prompt cleanup the single most impactful intervention.
If your dog eats feces, you're not alone — and your dog isn't "broken." Coprophagia is one of the most common behavioral complaints veterinarians hear, affecting an estimated 23-25% of the dog population at some point in their lives. While it's deeply unpleasant for owners, understanding the science behind this behavior is the key to resolving it effectively.
Why Do Dogs Eat Feces? The Science Explained
The Research
In 2018, Dr. Benjamin Hart and colleagues at the University of California, Davis School of Veterinary Medicine published findings from a two-stage survey of approximately 3,000 dog owners. The study challenged several long-held assumptions about coprophagia:
- Dietary deficiency is NOT the primary cause. Dogs on nutritionally complete diets were just as likely to eat feces as those on lower-quality food.
- Freshness matters enormously. Over 92% of coprophagic dogs consumed feces that were less than 24 hours old — often their own, immediately after defecation.
- Breed predisposition exists. Greedy eaters and breeds with strong oral fixation tendencies (Labrador Retrievers, Beagles, Terriers) showed higher rates.
- Punishment doesn't work. Dogs whose owners used scolding or aversive methods showed no reduction in the behavior compared to dogs whose owners used management and positive reinforcement.
The Neurological Mechanism
When a dog encounters feces, their olfactory system processes the scent through approximately 300 million olfactory receptors (compared to roughly 6 million in humans). The odor molecules from partially digested proteins, fats, and gut bacteria activate the dog's accessory olfactory bulb, which connects directly to the amygdala and hypothalamus — brain regions governing appetite and reward-seeking behavior.
For some dogs, the scent profile of fresh feces — particularly from herbivores or other dogs fed protein-rich diets — triggers what behavioral scientists call an appetitive response. The feces smell like food because, from a chemical standpoint, they still contain recognizable food compounds. Undigested proteins, fats, and carbohydrates remain in canine feces, and a dog's digestive system only extracts roughly 70-80% of nutrients from a single pass through the gut.
The Evolutionary Roots: Why Ancestral Dogs Ate Feces
Evolutionary Context
Coprophagia is widespread across the animal kingdom. In ancestral canids, consuming feces served several adaptive functions:
- Den hygiene: Mother wolves and wild dogs consume the feces of their puppies during the first 3-4 weeks of life to keep the den clean and reduce scent trails that could attract predators. This maternal behavior is well-documented in Canis lupus and is hormonally driven by oxytocin and prolactin surges post-whelping.
- Nutrient recovery: In environments where food was scarce, re-ingesting partially digested plant matter from herbivore feces provided additional calories and micronutrients. Wild canids near human settlements have long consumed livestock feces for this reason.
- Gut microbiome seeding: Young canids may ingest adult feces to acquire beneficial gut bacteria — a practice called coprophagic inoculation that helps establish a mature intestinal microbiome. Research published in the Merck Veterinary Manual notes that this behavior is observed in many mammalian species during developmental stages.
- Parasite avoidance (paradoxically): By consuming fresh feces quickly, adult canids could prevent parasite larvae from developing — many intestinal parasites require 1-5 days outside the host to become infective.
The takeaway: coprophagia isn't a "bad habit" your dog picked up — it's a deeply ingrained ancestral behavior that modern domestic life simply hasn't selected against. Understanding this helps reframe the problem from a moral failing to a management challenge.
Is Coprophagia Normal? When It Signals a Problem
Intermittent coprophagia — particularly in puppies under 12 months — falls within the normal behavioral range. Puppies explore the world orally, and many outgrow the behavior by adulthood as their oral exploration drive decreases and their gut microbiome matures.
However, coprophagia can sometimes signal an underlying medical issue. You should consult your veterinarian if your dog exhibits any of the following alongside feces-eating:
| Condition | Mechanism | Accompanying Signs |
|---|---|---|
| Exocrine Pancreatic Insufficiency (EPI) | Pancreas fails to produce digestive enzymes; feces contain large amounts of undigested nutrients | Weight loss despite ravenous appetite, large greasy stools, flatulence |
| Intestinal Parasites | Parasites steal nutrients, creating genuine hunger; some cause malabsorption | Pot-bellied appearance (puppies), scooting, diarrhea, visible worms |
| Diabetes Mellitus | Inability to utilize glucose creates persistent hunger (polyphagia) | Excessive thirst, frequent urination, weight loss |
| Cushing's Disease (Hyperadrenocorticism) | Excess cortisol drives increased appetite | Hair loss, pot-bellied appearance, increased thirst/urination |
| Malabsorption Syndromes | Intestinal inflammation prevents nutrient uptake | Chronic soft stools, weight loss, poor coat condition |
Your veterinarian will typically run a fecal flotation test ($25-$45), a complete blood count and chemistry panel ($80-$200), and potentially a canine pancreatic lipase (cPL) or TLI test ($50-$120) if EPI is suspected. These diagnostics rule out the medical causes before you invest time in behavioral modification.
How to Stop a Dog From Eating Feces: Evidence-Based Strategies
Once medical causes are ruled out, the following strategies are ranked by effectiveness based on current behavioral science:
1. Environmental Management (Highest Impact)
The UC Davis study found that prompt feces removal was the single most effective intervention. Since 92% of coprophagic dogs target fresh feces:
- Leash-walk your dog and pick up feces within 60 seconds of elimination using a poop bag
- In yard settings, accompany your dog outside and retrieve feces immediately
- If you have a multi-dog household, separate dogs during elimination times so one cannot eat the other's feces
- For cats in the home: use a top-entry litter box (such as the Modkat XL, ~$80-$100) or place the litter box behind a baby gate with a cat-sized opening — canine access to cat feces is one of the most common coprophagia triggers
2. Positive Reinforcement: The "Leave It" and "Come" Protocol
This force-free training approach teaches your dog that moving away from feces earns a better reward:
- Teach "Leave It" indoors first. Place a low-value treat on the floor, cover it with your hand, and reward from your other hand when your dog stops trying to get it. Progress to uncovered items over 5-7 training sessions (5 minutes each).
- Build a "Come" recall after elimination. Immediately after your dog defecates, call them to you enthusiastically and reward with a high-value treat (freeze-dried liver, ~$8-$15 per bag, works well because the strong scent competes with the feces odor).
- Practice on-leash in the yard. When your dog finishes eliminating, say "let's go" and move briskly away, rewarding after 3-5 steps. This builds a habit of moving away from the elimination site.
- Gradually increase freedom. Only allow off-leash yard time once your dog reliably moves away from feces on cue — typically 4-8 weeks of consistent practice.
3. Dietary Interventions
While the UC Davis study found that diet quality alone doesn't cause coprophagia, certain dietary adjustments can help:
- Feed a complete and balanced diet with an AAFCO statement of nutritional adequacy. Look for foods with a minimum of 22% crude protein (dry matter basis) for adult maintenance.
- Divide meals into 2-3 smaller portions per day to maintain stable blood sugar and reduce hunger-driven scavenging.
- Add a digestive enzyme supplement (such as Purina Pro Plan Veterinary Enzymes or Animal Essentials Plant Enzymes, $15-$30) to improve nutrient absorption and reduce undigested material in feces.
- Commercial deterrent products containing Yucca schidigera, parsley leaf, or monosodium glutamate (such as For-Bid, ~$15-$20 for a 4-month supply, or NaturVet No-Coprophagia, ~$12-$18) can make feces taste bitter. These work for approximately 50-60% of dogs based on owner surveys, but effectiveness varies individually.
Common Myths About Coprophagia — Debunked
| Myth | What the Science Says |
|---|---|
| "Dogs eat poop because their food lacks nutrients." | The UC Davis study found no correlation between diet quality and coprophagia. Dogs on premium, AAFCO-approved diets were equally affected. The behavior is driven more by instinct and opportunity than nutritional gaps. |
| "Adding meat tenderizer or pineapple to food will stop it." | The theory is that papain (from papaya/pineapple) or bromelain alters feces taste. There is no peer-reviewed evidence supporting this. Some owners report anecdotal success, but controlled studies are lacking. Commercial products with standardized ingredients are more reliable. |
| "Dogs eat poop to 'get back at' their owners." | Dogs do not possess the cognitive capacity for revenge or spite. This is anthropomorphizing. Coprophagia is driven by appetite, instinct, and learned reinforcement — not emotional manipulation. |
| "Scolding or rubbing their nose in it will teach them to stop." | Aversive punishment is both ineffective and counterproductive. The UC Davis study confirmed no difference in outcomes between punitive and positive methods. Worse, punishment can create fear of eliminating in front of you, leading to hiding and indoor accidents. |
| "Only sick or neglected dogs eat poop." | Approximately 1 in 4 dogs engage in coprophagia regardless of health status, diet quality, or level of care. It's a species-typical behavior, not a sign of poor ownership. |
Breed Variations and Individual Risk Factors
While any dog can develop coprophagia, certain breeds and behavioral profiles show higher prevalence:
- High prevalence breeds: Labrador Retrievers, Beagles, Shetland Sheepdogs, and terrier breeds. These breeds tend toward strong oral fixation and food-motivated behavior.
- Multi-dog households: Dogs living with 2+ other dogs show higher rates, likely due to competitive scavenging instincts and increased access to fresh feces.
- "Greedy eaters": Dogs that eat their meals rapidly (in under 2 minutes) are significantly more likely to engage in coprophagia. Using a slow-feeder bowl (such as the Outward Hound Fun Feeder, ~$10-$18) can slow eating and reduce this tendency.
- Spayed/neutered dogs: Interestingly, the UC Davis study found slightly higher rates in neutered dogs, though the mechanism is not fully understood.
- Anxiety and attention-seeking: Dogs that receive a strong reaction (even negative) from their owners when caught eating feces may repeat the behavior for attention. This is a learned operant conditioning loop — your dramatic reaction becomes the reward.
Health Risks: What Does It Mean When My Dog Eats Feces?
Beyond the obvious disgust factor, coprophagia carries real health risks that make intervention important:
- Parasite transmission: Roundworms (Toxocara canis), hookworms (Ancylostoma caninum), whipworms (Trichuris vulpis), and Giardia can all be transmitted through fecal ingestion. Note: most parasite eggs require 1-5 days to become infective, which is why prompt cleanup also protects your dog from parasitic reinfection.
- Zoonotic risk: If your dog eats feces and then licks your face or hands, parasites like Toxocara canis can be transmitted to humans — particularly dangerous for children. The CDC estimates that approximately 14% of the US population has been exposed to Toxocara.
- Bacterial exposure: Salmonella, E. coli, and Campylobacter are all present in feces and can cause gastrointestinal illness in both dogs and humans.
- Toxin ingestion: If your dog eats the feces of an animal that ingested poison bait (rodenticide), secondary poisoning is possible — though rare.
How Is Coprophagia Different in Dogs vs. Humans?
Humans find feces universally repulsive due to a combination of cultural conditioning and an evolved disgust response mediated by the insular cortex. This disgust response is adaptive — it protects us from pathogen exposure. Dogs, however, lack this specific disgust mechanism for feces. Their olfactory-driven food selection means that if something smells like it contains usable nutrients (and fresh canine feces often does, due to incomplete digestion), the brain categorizes it as a potential food source rather than a contaminant.
Additionally, dogs have a significantly shorter digestive tract relative to body size compared to humans, meaning food passes through more quickly and with less complete nutrient extraction. This incomplete digestion is precisely why feces retain enough food-like chemical signatures to trigger an appetitive response in dogs.
Related Behaviors: What Else to Watch For
Coprophagia often clusters with other oral-exploratory and scavenging behaviors:
- Pica: Eating non-food items (rocks, socks, mulch). May indicate nutritional deficiency, anxiety, or boredom. Requires veterinary evaluation.
- Counter-surfing and trash raiding: These are driven by the same scavenging instinct. Management strategies (secure trash cans with locking lids, such as the simplehuman Step Can, ~$70-$200) overlap with coprophagia prevention.
- Grass eating: Extremely common (estimated 68% of dogs) and generally harmless. Unlike coprophagia, grass eating rarely indicates a medical problem unless accompanied by frequent vomiting.
- Urine drinking (urophagia): Some coprophagic dogs also drink urine — from puddles, snow, or even their own. This is similarly driven by scent-triggered appetitive responses and managed through the same environmental strategies.
Practical Takeaways: Your 30-Day Action Plan
Week 1: Medical Screening
- Schedule a veterinary wellness exam with fecal flotation and bloodwork ($100-$250 depending on your area)
- Begin immediate feces pickup — accompany your dog on every bathroom break
- Secure all litter boxes and remove access to other animals' feces
Week 2: Training Foundation
- Start "Leave It" training: 2 sessions/day, 5 minutes each
- Practice recall after elimination: reward with high-value treats every time
- Introduce a slow-feeder bowl if your dog eats meals rapidly
Week 3: Dietary Adjustments
- Divide meals into 3 smaller portions
- Consider adding a digestive enzyme supplement
- Optionally trial a commercial coprophagia deterrent (give it 2-4 weeks to assess effectiveness)
Week 4: Integration and Assessment
- Continue all management and training protocols
- Test supervised off-leash yard time — does your dog move away from feces on cue?
- If the behavior persists, consult a certified professional dog trainer (CPDT-KA) or veterinary behaviorist (DACVB). Expect to pay $80-$200 per session for a CPDT-KA or $200-$400 for a veterinary behaviorist consultation.
Frequently Asked Questions
Why do dogs eat their own feces but not other dogs'?
Actually, the UC Davis study found the opposite for many dogs — some prefer other dogs' feces over their own. However, self-coprophagia (eating their own feces immediately after elimination) is common in dogs with strong oral fixation tendencies. The dog isn't making a "preference" in a cognitive sense; they're responding to the immediate sensory stimulus of a warm, freshly deposited item that smells like food.
Can dogs get sick from eating cat feces?
Yes. Cat feces can carry Toxoplasma gondii, a protozoan parasite that can infect dogs (though dogs are not the definitive host). Cat feces also tend to be higher in protein and fat (reflecting cats' obligate carnivore diet), making them especially attractive to dogs. Additionally, clumping cat litter ingested alongside feces can cause gastrointestinal blockage. This is why blocking litter box access is essential.
How do dogs process the smell of feces differently than humans?
Dogs possess approximately 300 million olfactory receptors (humans have roughly 6 million) and an olfactory processing area in the brain that is proportionally 40 times larger than ours. Where humans smell "waste," dogs detect specific volatile organic compounds — undigested amino acids, short-chain fatty acids, and bacterial metabolites — that their brains interpret as potential food signals. The American Kennel Club notes that this olfactory difference is fundamental to understanding many canine behaviors that humans find baffling.
Is coprophagia more common in puppies?
Yes. Puppies explore their environment orally, and coprophagia during the 3-6 month developmental window is extremely common. Most puppies outgrow it by 9-12 months as oral exploration decreases. However, if the behavior is inadvertently reinforced (your dog discovers that eating feces gets a dramatic reaction from you), it can persist into adulthood as a learned behavior.
What does it mean when my adult dog suddenly starts eating feces?
A sudden onset of coprophagia in an adult dog who previously didn't engage in the behavior warrants a veterinary visit. It can signal a new medical condition (EPI, diabetes, Cushing's disease, parasitism), a dietary change that reduced nutrient absorption, or a significant environmental stressor (new pet, move, schedule change). Rule out medical causes before assuming it's purely behavioral.
Are coprophagia deterrent supplements safe?
Most commercially available deterrents (For-Bid, NaturVet No-Coprophagia, Deter) use food-grade ingredients like Yucca schidigera extract, parsley, chamomile, and digestive enzymes. These are generally safe for long-term use. However, some products contain MSG (monosodium glutamate), which is safe for dogs in the small quantities used but may concern some owners. Always check the ingredient list and consult your veterinarian before starting any supplement, especially if your dog has pre-existing health conditions or takes medications.
References
- Hart, B.L., Hart, L.A., Thigpen, A.P., Tran, A., & Bain, M. (2018). "The paradox of diet-averse dogs eating feces." Applied Animal Behaviour Science, University of California, Davis.
- American Kennel Club: Why Dogs Eat Poop and How to Stop It
- Merck Veterinary Manual: Behavioral Problems in Dogs
Anouk Beaumont
All our authors care for dogs every day — read more of their work on the authors page.
