Why your dog eats poop (coprophagia) and how to stop it

In 30 seconds

Coprophagia (eating its own stool or another animal's) is fairly common: Hart's 2018 study found that 16% of dogs were "frequent eaters" of other dogs' stool. Most cases trace back to evolution (mothers eat their puppies' stool to keep the den clean) or to behavior, not a nutritional deficit. Before assuming it's just a habit, rule out the medical causes: parasites, intestinal malabsorption, enzyme deficiencies, diabetes. The practical fix combines immediate management, a well-trained "leave it," and in some cases a diet change or supplementation.

Telling the types apart

Type	What it eats	Frequency
Autocoprophagia	Its own stool	Less common, more concerning behaviorally
Canine allocoprophagia	Other dogs' stool	The most common (16% in Hart's study)
Other animals' stool	Horse, rabbit, cat, herbivores	Frequent, drawn by partly undigested nutrients
Human waste	Diapers, bathrooms	Less common, can signal a deficiency or a serious behavioral problem

The consequences and the approach change with the type.

Medical causes to rule out first

If your dog started eating stool recently, or does it intensely, rule out a medical cause before assuming it's behavior:

Cause	Diagnostic test
Intestinal parasites	Fecal exam
Exocrine pancreatic insufficiency (EPI)	Serum TLI test
Malabsorption / enteropathy	Bloodwork plus biopsy if indicated
Diabetes	Blood glucose
Cushing's disease	Specific endocrine tests
Enzyme deficiency	Nutritional assessment
Polyphagia from an inadequate diet	Review of food amount and quality

Nearly 30% of persistent coprophagia cases in adult dogs are tied to an underlying medical problem. Run a fecal exam at minimum before starting behavioral work.

Behavioral and evolutionary causes

When there is no medical cause, the documented factors are:

• Evolutionary inheritance: female wolves eat their puppies' stool to keep the den free of odors that would draw predators. The behavior persists in some adult individuals.
• Habit from puppyhood: puppies raised in cramped conditions (low-quality breeders, some puppy mills) learn to eat stool out of boredom or lack of stimulation.
• Scent attraction: herbivore stool holds undigested plant matter and residual nutrients that smell appealing.
• Attention reinforcement: if you sprint over yelling every time your dog goes for stool, the behavior gets loaded with human attention.
• Boredom or anxiety: dogs with little mental stimulation can develop the behavior as self-soothing.

The four-track approach

1. Immediate management

• Pick up your dog's stool right away from the yard or patio.
• On walks, keep a short leash and your attention in areas thick with stool (dog parks, rural land with livestock).
• A well-trained "leave it" or "drop it" for emergencies.

2. Diet change

Some cases improve with:

• Higher-quality, more digestible food. Cheap foods loaded with fillers produce more nutritious stool, which is appealing to some dogs.
• Probiotics formulated for canine gut flora.
• Enzyme supplements with bromelain or papain (the effect is debated but documented in some dogs).
• Deterrent additives such as pineapple-based products that make the dog's own stool less palatable (they do nothing for other animals' stool).

Always make diet changes with your veterinarian's guidance.

3. "Leave it" training

A well-built "leave it" is the most effective working tool. Your dog learns that ignoring stool earns a better reward than eating it. Combined with management, this resolves most cases in 2-3 months.

4. More mental stimulation

If your dog lives in an apartment with little activity and the coprophagia looks like self-stimulation, try:

• More scent games (hiding treats around the house, snuffle mats).
• More basic training (5-10 minutes a day).
• Longer walks with free sniffing.
• Stuffed Kongs and long-lasting chew toys.

Is it dangerous?

The health risk varies by type:

Source	Risk
Own stool	Low (parasites only with active reinfection)
Stool from vaccinated, dewormed dogs	Low to medium (giardia, isospora possible)
Stool from unknown dogs	Medium to high (parvovirus, parasites, bacteria)
Cat stool	Medium (toxoplasma, especially litter with urine)
Horse or cow stool	Low to medium (specific parasites, salmonella)
Human waste	Low to medium (medications, specific parasites)

If your dog eats other animals' stool regularly, a quarterly deworming schedule is prudent.

What doesn't work

Method	Why it fails
Punishing the dog when you catch it	It doesn't connect the scolding to the act. It learns to hide and eat in secret
Rubbing its nose in the stool	Aversive, traumatic, no educational value
Putting pepper or hot sauce on known stool	Sours the dog's temperament, and sometimes it still likes the taste
Switching food constantly with no diagnosis	Digestive instability. It doesn't fix anything without knowing the cause

When it signals something more

See a veterinary behaviorist if:

• The coprophagia is intensive autocoprophagia with no identifiable medical cause.
• It shows up alongside other behavioral signs (compulsions, anxiety, self-injury).
• It persists after 3-4 months of correct work.
• An older dog that never did it before suddenly starts (it can signal cognitive decline or an undiagnosed medical problem).

What to check

1. Have you run a fecal exam and basic bloodwork? Without ruling out a medical cause, the behavioral work is blind.
2. Is your food high quality and the portion correct? Cheap food and excessive stool make the behavior more likely.
3. Do you pick up your dog's yard stool within a couple of hours? Without management, there is no fix.
4. Have you trained "leave it" to the point of reliability? It's the main working tool.
5. If your dog eats other animals' stool on walks, deworm every 3 months with no exceptions.