Dogs Eat Their Own Poop? Canine Coprophagia

The Uncomfortable Truth About Canine Coprophagia

You're on a morning walk, your dog sniffs an interesting spot, and before you can react — they've eaten their own feces. If you're wondering why do dogs eat their own poop, you're not alone. According to a study published in the journal Animal Behaviour, approximately 16% of dogs engage in coprophagia (the scientific term for feces-eating) frequently enough for owners to notice, and up to 25% will try it at least once in their lifetime.

While this behavior is deeply unsettling for most dog owners, understanding the root causes is the first step toward stopping it. Coprophagia in dogs can stem from medical conditions, nutritional gaps, behavioral patterns, or simple evolutionary instinct. In many cases, it's a combination of factors that requires a multi-pronged approach to resolve.

Medical Reasons Dogs Eat Feces

Before assuming your dog's poop-eating is "just a bad habit," it's critical to rule out medical causes. Several conditions can trigger or worsen coprophagia, and treating the underlying illness often resolves the behavior entirely.

Malabsorption and Digestive Disorders

Dogs with exocrine pancreatic insufficiency (EPI), inflammatory bowel disease (IBD), or intestinal parasites may eat feces because their bodies aren't extracting adequate nutrients from food. When a dog's digestive system fails to break down and absorb nutrients properly, the feces may still contain partially digested proteins and fats — making them smell and taste like food to the dog.

According to the Merck Veterinary Manual, EPI affects approximately 1 in 1,000 dogs and is most common in German Shepherds, Collies, and English Setters. Dogs with EPI typically show weight loss despite a ravenous appetite, large volumes of pale, fatty stools, and coprophagia.

Parasite Infections

Intestinal parasites — particularly roundworms, hookworms, and giardia — steal nutrients from your dog's digestive tract. A dog burdened with parasites may eat feces in an attempt to reclaim lost nutrition. Fecal flotation tests at your vet's office (typically $45–$85) can identify most common parasites.

Diabetes and Cushing's Disease

Both diabetes mellitus and hyperadrenocorticism (Cushing's disease) cause polyphagia — excessive hunger — even when a dog is eating adequate calories. This relentless hunger can drive dogs to eat non-food items, including feces. If your dog has increased thirst, increased urination, and a pot-bellied appearance alongside coprophagia, these endocrine conditions should be investigated.

Medication Side Effects

Certain medications, particularly corticosteroids (prednisone, dexamethasone) and some anticonvulsants (phenobarbital), can significantly increase appetite as a side effect. Dogs on these medications may become opportunistic eaters, consuming anything available — including stool.

Behavioral and Evolutionary Explanations

When medical causes are ruled out, behavioral and evolutionary factors usually explain why do dogs eat their own poop. These causes are more common than medical ones and often require consistent training and environmental management to resolve.

The Maternal Instinct Connection

Mother dogs (dams) naturally consume the feces of their puppies during the first three weeks of life. This behavior serves two evolutionary purposes: it keeps the den clean to avoid attracting predators, and it prevents parasitic contamination of the whelping area. Puppies who observe this behavior may learn to mimic it, which is one reason coprophagia is more common in young dogs.

Attention-Seeking and Anxiety

Dogs quickly learn that eating feces gets a dramatic reaction from their owners. Even negative attention — yelling, chasing, or grabbing at their mouth — can reinforce the behavior in attention-starved dogs. Similarly, dogs with separation anxiety or confinement distress may eat feces as a self-soothing behavior or as a displacement activity when stressed.

Resource Guarding and Scarcity Mindset

Dogs who experienced food scarcity early in life — particularly those from puppy mills, hoarding situations, or shelters with inadequate feeding protocols — may develop a compulsion to eat anything that resembles food. Feces, which contain partially digested nutrients and carry the scent of food, trigger this scavenging instinct.

Boredom and Lack of Stimulation

Under-stimulated dogs left in yards or kennels for long periods may eat feces simply because there's nothing else to interact with. This is particularly common in working breeds (Border Collies, Belgian Malinois, German Shepherds) who need significant mental and physical exercise but aren't receiving it.

Is There a Nutritional Deficiency Behind Poop Eating?

One of the most persistent myths about coprophagia is that dogs eat feces because their diet is missing something — specifically vitamins, minerals, or enzymes. While this theory is widely repeated, the scientific evidence is mixed.

What the Research Actually Shows

A study by the American Kennel Club's veterinary advisory board found that the vast majority of coprophagic dogs are on nutritionally complete diets that meet AAFCO (Association of American Feed Control Officials) standards for all life stages. Switching to a "premium" or "holistic" diet rarely eliminates the behavior on its own.

However, there are specific nutritional scenarios where diet plays a role:

• Underfeeding: Dogs on calorie-restricted diets (whether intentional for weight loss or accidental) may seek additional calories from feces. Check your dog's body condition score (BCS) — a score of 4-5 on the 9-point Purina scale indicates ideal weight.
• Low-fiber diets: Some evidence suggests that dogs on very low-fiber diets may eat feces to obtain roughage. Adding 1–2 tablespoons of canned pumpkin (not pie filling) per 25 lb of body weight can increase satiety.
• High-carbohydrate kibble: Diets heavy in fillers like corn, wheat, and soy may leave dogs feeling unsatisfied despite adequate caloric intake, driving them to seek additional food sources.

The Enzyme Supplement Question

Over-the-counter coprophagia deterrents like For-Bid, CoproBan, and NaturVet Deterrent often contain digestive enzymes (amylase, protease, lipase) or compounds like monosodium glutamate (MSG) or yucca schidigera extract that are designed to make feces taste unpleasant. These products cost $12–$30 for a 30-day supply and work for approximately 50% of dogs, according to veterinary behaviorist surveys. They are not a standalone solution but can be part of a comprehensive management plan.

Proven Strategies to Stop Coprophagia

Successfully stopping your dog from eating feces requires addressing the root cause while managing the environment to prevent rehearsal of the behavior. Every time your dog successfully eats feces, the behavior is reinforced — making it harder to extinguish.

Immediate Environmental Management

1. Supervise all outdoor time. Keep your dog on a 6-foot leash during bathroom breaks. This allows you to redirect immediately after they eliminate.
2. Pick up feces immediately. Use biodegradable poop bags and remove all stool from your yard at least twice daily. If your dog has no access to feces, they can't eat it.
3. Teach a solid "leave it" cue. Using positive reinforcement training, teach your dog to turn away from items on the ground in exchange for a high-value treat (freeze-dried liver, small pieces of chicken). Practice with low-value items first, gradually working up to food dropped on the ground.
4. Feed a satisfying diet. Ensure your dog's food meets AAFCO complete-and-balanced standards and that you're feeding the correct amount for their ideal body weight, not their current weight if they're overweight.

Training Protocols That Work

Certified professional dog trainers recommend a two-pronged approach: counter-conditioning (changing the dog's emotional response to feces) and differential reinforcement (rewarding an incompatible behavior).

Counter-conditioning protocol: Each time your dog eliminates outdoors, immediately call them to you and reward with 3–5 high-value treats (something they don't normally get). Over 4–6 weeks, the dog learns that eliminating means running to the owner for something better than what's behind them.

Differential reinforcement: Teach your dog to carry a toy in their mouth during walks. A dog with a ball or tug toy in their mouth physically cannot eat feces. Reward them generously for holding the toy, especially near tempting spots.

Multi-Dog Household Strategies

If you have multiple dogs and one is eating the other's feces, management becomes more complex. Feed dogs separately and walk them individually for bathroom breaks. Consider adding a digestive supplement containing yucca schidigera to the "target" dog's food — this compound makes the resulting feces taste bitter and unappealing to the coprophagic dog.

When Coprophagia Signals a Veterinary Emergency

While most coprophagia is a nuisance behavior rather than a health emergency, certain scenarios require immediate veterinary attention. Consult your veterinarian promptly if your dog's feces-eating is accompanied by any of the following red flags:

Zoonotic Risks: Can Humans Get Sick from a Coprophagic Dog?

Yes — and this is one of the most underappreciated risks of canine coprophagia. Dogs who eat feces can carry zoonotic pathogens (diseases transmissible to humans) on their mouths, tongues, and fur. If your dog eats feces and then licks your face, hands, or food preparation surfaces, transmission is possible.

The primary zoonotic concerns include:

• Roundworm (Toxocara canis): Eggs can be present in dog feces and transmitted to humans, potentially causing visceral larva migrans — a condition where larvae migrate through human organs. The CDC estimates 10,000+ human cases annually in the US.
• Hookworm (Ancylostoma caninum): Can cause cutaneous larva migrans in humans — an intensely itchy skin condition.
• Giardia and Cryptosporidium: Protozoan parasites that cause gastrointestinal illness in humans.
• E. coli and Salmonella: Bacterial pathogens that can cause food-poisoning-type illness.

To minimize zoonotic risk, practice thorough handwashing after handling your dog, avoid letting them lick your face, and maintain regular deworming protocols as recommended by your veterinarian (typically every 3–6 months for adult dogs, more frequently for puppies).

Frequently Asked Questions About Coprophagia

Why does my dog eat cat poop but not dog poop?

Cat feces typically contain higher levels of protein and fat than dog feces because cats are obligate carnivores with highly concentrated diets. To a dog, cat poop smells more like food. This is one of the most common forms of coprophagia and can be managed by using covered litter boxes or placing the litter box behind a baby gate that the cat can jump over but the dog cannot.

Does pineapple stop dogs from eating poop?

The theory is that bromelain, an enzyme in fresh pineapple, makes feces taste unpleasant. While some owners report success, there's no peer-reviewed evidence supporting this. If you want to try it, offer 2–3 small chunks of fresh pineapple (not canned in syrup) per 25 lb of body weight daily. Never feed pineapple core or skin, which are choking hazards.

Will my puppy outgrow coprophagia?

Many puppies experiment with feces-eating between 4 and 9 months of age, and approximately 60–70% will stop without intervention by 12 months. However, the remaining 30–40% develop a persistent habit that becomes harder to break over time. Early intervention with environmental management and positive reinforcement training significantly improves outcomes.

Are coprophagia deterrent supplements safe?

Most commercial deterrents (For-Bid, CoproBan, NaturVet Deterrent) are safe for long-term use and contain ingredients like MSG, yucca extract, or digestive enzymes. However, some contain garlic powder in small amounts — while the dose is typically well below toxic thresholds, dogs with certain sensitivities or G6PD deficiency should avoid them. Always consult your veterinarian before starting any supplement.

My dog eats other dogs' poop at the dog park — what can I do?

This is one of the hardest scenarios to manage. Keep your dog on-leash in areas where other dogs have eliminated, practice a strong "come" and "leave it" cue using high-value rewards, and consider a basket muzzle (like the Baskerville Ultra or Jafco Clear Vinyl muzzle) during park visits while you work on training. A muzzle is a management tool, not a punishment — introduce it gradually with positive associations over 1–2 weeks.

How long does it take to stop coprophagia with training?

With consistent daily training and environmental management, most dogs show significant improvement within 4–8 weeks. Complete resolution may take 3–6 months, especially in dogs who have practiced the behavior for years. Setbacks are normal — if your dog has access to feces and successfully eats it during training, expect a temporary increase in the behavior before improvement resumes.