Why Does My Dog Eat Poop?

The Day I Found Out

I remember it clearly because it was a Saturday morning and I'd just made coffee. I was watching our dog Remy — a goofy two-year-old Golden Retriever mix — through the kitchen window while he did his business in the backyard. And then, instead of the usual sniff-and-walk-away, he just… turned around and helped himself.

I stood there with my coffee mug halfway to my face. Completely frozen.

My first reaction was that something had to be seriously wrong with him. Was he sick? Was he missing something in his diet? Had I somehow failed as a dog owner? I called our vet's office that same morning, whispering the question to the receptionist like I was reporting a crime. She laughed — kindly — and said: "You're at least the third person this week to call about that."

That phone call started a fairly obsessive research session on my part. I've since read through veterinary studies, gone down the forums, and watched my own dog closely enough to understand why he was doing it. I'm not a vet. But I've spent an unreasonable number of hours trying to figure this out, and here's everything I've learned.

What Is Coprophagia, Exactly?

Coprophagia is the formal veterinary term for when an animal eats feces — either their own, another dog's, or another species' entirely. It sounds clinical and alarming, but the behavior itself has been observed in dogs for as long as dogs have existed. It is not a new problem, and it is not a sign that something has gone wrong in the modern pet world.

Puppies do it commonly and usually outgrow it. Mother dogs do it naturally with their newborns. And a surprising percentage of adult pet dogs do it with no apparent rhyme or reason — or at least, no reason that's immediately obvious to the humans watching them.

What it is not, in most cases, is a sign that your dog is seriously ill. That was the first thing I needed to hear.

What the Research Actually Found

In 2018, veterinary behaviorist Dr. Benjamin L. Hart and his colleagues at the University of California, Davis published what became the most comprehensive study on this topic: "The paradox of canine conspecific coprophagy" in Veterinary Medicine and Science. They surveyed over 3,000 dog owners about their dogs' poop-eating habits. The numbers were eye-opening.

• 16% of dogs were observed eating poop on five or more occasions — meaning they are consistent, habitual coprophages.
• 23% were observed doing it at least once.
• The vast majority (over 80%) only ate fresh feces — within two days old. Old, dried poop held far less interest.
• Dogs living in multi-dog households were more likely to engage in the behavior.
• Dogs described by their owners as "greedy eaters" were about three times more likely to eat poop.
• There was no significant correlation with diet quality — premium-food dogs and budget-food dogs did it at similar rates.

That last finding surprised me most. The internet is full of advice suggesting the problem is nutritional — that if you just feed your dog a better food, the behavior will stop. The science doesn't support that. Diet quality, on its own, does not reliably predict whether a dog will eat poop.

Why Dogs Actually Eat Poop

The causes divide reasonably cleanly into two categories: behavioral and medical. Most cases are behavioral. Medical causes are less common but important to rule out — especially if the behavior started suddenly in a dog who never did it before.

Evolutionary instinct

Dogs evolved from wolves, and wild canids are scavengers. Eating feces — especially the feces of prey animals — was a normal part of foraging. A wolf eating deer droppings is consuming partially digested plant matter and micronutrients. Over thousands of years of domestication, that instinct didn't fully disappear in every dog. For some dogs, sniffing and sampling feces is just... what you do when you're investigating a scent.

Dr. Hart's study actually proposed an evolutionary hypothesis: that ancestral dogs may have eaten fresh feces specifically to protect the pack from intestinal parasites — since fresh stool doesn't yet carry infective parasite eggs, but stool left for more than a day or two does. The preference for fresh feces, seen consistently in studies, aligns neatly with this idea.

Puppies and maternal behavior

Mother dogs clean up after their puppies by consuming the puppies' waste. This is normal and necessary behavior — it keeps the den sanitary and eliminates odors that might attract predators. Some puppies observe this and mimic it as part of exploring their world. Most puppies who engage in coprophagia stop on their own by 9 months of age, without any intervention. If your puppy is eating poop and is otherwise healthy, playful, and eating well, there's a decent chance this resolves itself.

Boredom and under-stimulation

A dog with not enough to do will find something to do. Feces in the yard is an olfactory experience — it has strong scent, it's interesting, and interacting with it passes the time. Dogs who spend long stretches alone, or who don't get adequate exercise and mental stimulation, are more likely to engage in behaviors that stimulate them in ways their environment isn't providing.

If your dog's poop-eating happens predominantly when they've been alone or on low-activity days, boredom is high on the suspect list.

Confinement and kennel stress

Dogs that are crated or kenneled for long periods develop this behavior at higher rates. In a confined space where they cannot move away from their own waste, eating it can become a coping behavior. This is more common in dogs adopted from shelters or rescues, particularly those that spent time in overcrowded conditions. The behavior often improves significantly once the dog has consistent space, routine, and reduced confinement time.

Anxiety-driven behavior

Some anxious dogs eat poop as a self-soothing or compulsive behavior. If your dog has other signs of anxiety — pacing, excessive licking, destructive behavior when alone, or difficulty settling — and eats poop in conjunction with those patterns, anxiety may be the root cause rather than instinct or boredom. These cases benefit from addressing the anxiety specifically, not just managing the symptom.

Eating the "evidence"

This one was uncomfortable for me to read. Dogs that are harshly punished for going to the bathroom in the wrong place sometimes learn to eat the evidence to avoid the punishment. If your dog was trained with punishment-based methods — being yelled at, their nose rubbed in their accidents — they may have made the connection that poop = punishment, and eating it removes the problem. This is one of several reasons force-based housetraining methods tend to produce unintended consequences.

Seeking attention

Dogs learn very quickly what gets a reaction from you. If eating poop makes you run toward them, make alarmed noises, and engage with them dramatically — even if you're upset — some dogs will do it specifically for that attention. From the dog's perspective: action → owner reaction = the action worked. If your dog tends to eat poop when you're nearby and watches your face afterward, attention-seeking is worth considering.

Medical causes (less common, but real)

In a smaller percentage of cases, poop-eating has a medical driver. The main ones to know about:

• Exocrine Pancreatic Insufficiency (EPI) — the pancreas doesn't produce enough digestive enzymes, so food passes through largely undigested. Dogs with EPI often eat their own feces because their stool still smells strongly of undigested food. EPI is most common in German Shepherds and Rough Collies and typically causes dramatic weight loss despite a voracious appetite.
• Malabsorption syndromes — similar effect; food isn't properly absorbed, driving the dog to seek nutrition from any available source.
• Intestinal parasites — worms can cause enough nutritional deficiency to drive unusual eating behaviors.
• Conditions causing increased hunger — Cushing's disease, thyroid disorders, and diabetes can significantly increase appetite. Dogs on corticosteroids (prednisone) often show dramatically increased appetite that drives unusual food-seeking behavior.

The red flags that suggest a medical cause rather than a behavioral one: a dog who suddenly starts eating poop and never did before, especially if paired with weight loss, increased appetite, increased water intake, or a general change in condition.

Whose Poop Are We Talking About?

It matters, because the reasons differ.

• Own poop — usually behavioral (instinct, anxiety, attention-seeking) or potentially medical (EPI, malabsorption). This is the scenario most worth a vet conversation if it's new.
• Other dogs' poop — more likely instinctual/exploratory. Social investigation. The UC Davis study's multi-dog household finding is relevant here.
• Cat poop — extremely common and almost entirely dietary interest. Cat food is very high in protein and fat compared to dog food, so cat feces genuinely smells nutritionally appealing to a dog's nose. The solution here is usually just keeping the litter box somewhere the dog can't access it (baby gate, top-entry box, door with a small cat-flap).
• Wildlife and livestock poop (deer, rabbit, horse, goose) — foraging instinct. Deer and rabbit droppings especially seem to be irresistible to a lot of dogs. This is very difficult to train away entirely; management (keeping the dog on leash in affected areas) is usually more realistic than elimination.

What Doesn't Actually Work

I want to save you the time I wasted trying things I found on forums:

• Pineapple — the theory is that bromelain makes the poop taste bitter. In practice, research doesn't support this as reliable, and plenty of dogs continue the behavior regardless. Worth trying as a low-risk first step, but don't count on it.
• Meat tenderizer — similar idea, similar lack of evidence. Some products contain MSG or other additives that aren't ideal to feed daily.
• Commercial "poop stop" supplements — some dogs respond; many don't. These products mostly rely on the same logic as pineapple (making the poop taste aversive) and have the same fundamental limitation: they only work on that specific dog's poop, and only if every piece of accessible poop has been treated.
• Punishing the behavior — ineffective and often counterproductive. Punishment after the fact doesn't teach the dog what you want them to do instead, it just adds stress. It may also reinforce attention-seeking motivation or trigger the "eating the evidence" pattern described above.
• Simply hoping they'll outgrow it — puppies often do outgrow it. Established adult coprophages typically don't stop on their own.

What Actually Helps

Remove the opportunity first

This is the most reliably effective approach and it's the one vets most consistently recommend: pick up immediately after your dog goes. Don't give them the chance to turn around and eat it. In the backyard, clean up daily or after every elimination. On walks, maintain enough leash control to redirect them before they get to it. Management isn't a cure, but it breaks the habit and makes the other training approaches much easier to implement.

Train a solid "leave it"

A reliable "leave it" command gives you a real-time interruption. The key is training it proactively — when there's no poop around — so the cue is deeply reliable by the time you need it. Practice with food on the ground, with interesting smells, with other dogs' things. The goal is a dog that hears "leave it" and moves away immediately. Pair every "leave it" with a high-value reward and praise, so moving away from the thing becomes the behavior that pays off.

Address the underlying cause

Management stops the behavior in the moment. The underlying cause is what determines whether it stays stopped:

• If it's boredom → more exercise, puzzle feeders, training sessions, sniff-focused walks (a 20-minute sniff walk provides more mental stimulation than a 45-minute march)
• If it's anxiety → work on the anxiety itself, not just the poop. Consider talking to your vet about whether behavior modification, training, or medication support is appropriate.
• If it's attention-seeking → the counterintuitive fix is not to react. Don't run toward them, don't make alarmed sounds. Calmly redirect or use "leave it" without drama.
• If it's confinement stress → reduce crate/kenneling time where possible, provide more enrichment during confinement periods, ensure their space feels safe rather than stressful.

Rule out medical causes if warranted

If the behavior started suddenly, if your dog is losing weight despite eating well, or if they seem abnormally hungry all the time, bring it up with your vet before assuming it's behavioral. EPI in particular is very treatable once diagnosed — dogs with EPI often dramatically improve with enzyme supplementation — but it requires a vet workup to identify.

When to See a Vet

The Bottom Line

Remy, for what it's worth, still gets a sniff in when he thinks I'm not looking — but months of consistent clean-up, solid "leave it" training, and doubling his daily mental enrichment have reduced it from a daily occurrence to something I can redirect reliably. He wasn't sick. He was just under-stimulated and had stumbled on something that held his interest in the backyard.

Most dogs eating poop are more like Remy than like the medical cases. They're doing something that traces back to instinct or unmet needs, and with the right combination of management and root-cause work, it gets better. Not always completely gone — but better, and manageable.

And yes, I do enforce a strict no-face-licking rule now. Some lines you draw once and you don't negotiate.