Coprophagia in Dogs: Meaning and Medical Classification

What does it mean when a dog eats its own feces?

Coprophagia in dogs—the technical term for the behavior—refers to a dog eating feces, whether its own, those of other dogs (intraspecific), or those of other animal species such as horses, wild animals, or cats (interspecific). Coprophagia is common: studies suggest that about a quarter of all domestic dogs eat feces at least occasionally.

Important to note: Coprophagia in dogs is not necessarily a sign of illness. It is a behavior with an evolutionary history that, in many cases, is not pathological but rather a variant of normal behavior. Nevertheless, a veterinary check-up is advisable if the behavior occurs suddenly, intensifies, or is accompanied by other symptoms such as weight loss, diarrhea, hunger pangs, or changes in the coat. This article does not replace a veterinary examination.

Background and Academic Context

The most comprehensive study to date was conducted by Hart, Hart, Thigpen, Tran, and Bain (2018). In two large online surveys (n > 3000), they analyzed frequency, risk factors, and correlates. Key findings: About 16 percent of dogs frequently ate their own or other dogs’ feces; significant risk factors included multi-dog households, high activity levels, and a generally voracious appetite. No correlation was found with diet, worm infestation, or malnutrition—a key finding that debunks the myth of mineral deficiency.

Boze (2010) had already suggested that coprophagia in dogs represents an evolutionary legacy from wolves. The hypothesis: within the pack, consuming fresh feces served to keep the den free of parasites—a plausible hygienic function. Hart et al. (2018) aligned their data with this model.

In puppies, coprophagia is common due to developmental factors and is usually temporary. In adult dogs, the following applies: If coprophagia occurs for the first time, medical differential diagnoses should be ruled out—exocrine pancreatic insufficiency (EPI), malabsorption, parasitic infestation, diabetes mellitus, Cushing’s syndrome, or thyroid disorders can trigger or exacerbate coprophagia (Tilley & Smith 2015).

Vitomalia-Position

We recommend a multi-step approach. First, a veterinary examination to rule out or confirm any medical causes. Second, management—promptly remove feces, keep the dog on a Leash in high-risk areas, and use a muzzle if necessary. Third, behavioral analysis, if there is a learning or stress-related component.

We reject the blanket assumption of mineral deficiency. Some owners feed their dogs powdered supplements or rumen supplements for years without seeing any measurable improvement—because the available data does not support this approach. We also reject punishing the behavior; it often only makes the dog more secretive.

When does coprophagia become a concern in dogs?

This becomes relevant in three scenarios. In puppies, it is usually a transient condition that goes unnoticed until around 9 months of age, provided there are no symptoms. If it occurs suddenly in adult dogs, a veterinary examination is required. If a dog ingests horse droppings or wild animal feces during walks, there is a risk of hygiene issues and parasites (Giardia, tapeworms); see Parasites.

Practical application

1. Veterinary evaluation: digestion, weight, stool consistency, blood tests. Without this foundation, behavior training is like groping in the dark.
2. Pre-training guidelines: Pick up after your dog immediately. Scan for high-risk areas during walks.
3. Establishing a marker signal: Condition the dog to make eye contact – see “marker word.” Shift the dog’s attention away from the feces and toward the owner.
4. Muzzle training: When safety is a concern, a well-fitting, positively reinforced muzzle is the humane solution; see Muzzle.
5. Stress Check: In some dogs, coprophagia is linked to heightened arousal—see Stress.

Common Mistakes and Myths

• "Mineral deficiency is the cause." Hart et al. (2018) found no association. Mineral supplements taken without a medical indication do not resolve the behavior.
• "Tripe powder works." There is a lack of reliable evidence. Anecdotal success stories are possible, but they lack methodological control.
• "My dog isn't getting enough food." Hunger can be a factor in some cases (e.g., with diets that are too low in calories). The majority of coprophagous dogs are of normal weight.
• "Punishment helps." Punishment causes the owner to avoid the situation, not the behavior. This makes it more likely that the dog will eat its feces in secret.
• "Eating feces is just a puppy thing." While it is often normal in puppies, it is not necessarily the case in adults, though it is common. Hart et al. (2018) show that persistence into adulthood is not uncommon.

State of the art in 2026

Consensus: Coprophagia is common, often non-pathological, and difficult to influence with dietary supplements. Risk factors are behavioral (activity, multi-dog households, eating speed) and not primarily diet-related. Open questions: microbiome correlates, neurochemical triggers, efficacy of psychopharmacological adjuvants in severe cases. The dual strategy of medical evaluation and behavioral management remains clinically relevant.

Frequently Asked Questions

Is eating feces dangerous for my dog?

Their own feces usually do not. Feces from other animals can transmit parasites, viruses, or bacteria. Horse manure may contain active ingredients from deworming treatments that can be toxic to dogs (ivermectin in cases of MDR1 deficiency).

Which treatments are actually effective?

There is no evidence-based universal solution. Hart et al. (2018) reported success rates of less than 25 percent for commercial products.

When should I take my pet to the vet?

If symptoms appear suddenly, or if there are changes in weight, diarrhea, increased hunger, or hair loss. Even if the behavior has persisted for years without improvement, it’s worth getting it checked out.

Can puppies outgrow coprophagia?

Yes, this behavior often diminishes with maturity—unless it has been reinforced by attention or availability.

Related terms

• Parasites
• Muzzle
• Markerwort
• Stress
• Puppy Development
• Poisoned bait
• Anti-Poison Bait Training

Sources and further reading

1. Hart, B. L., Hart, L. A., Thigpen, A. P., Tran, A., & Bain, M. J. (2018). The paradox of canine conspecific coprophagy. Veterinary Medicine and Science, 4(2), 106-114.
2. Boze, B. G. V. (2010). Correlates of coprophagy in the domestic dog (Canis familiaris) as assessed by owner reports. Journal of Applied Companion Animal Behavior, 4(1), 28-38.
3. Tilley, L. P., & Smith, F. W. K. (2015). Blackwell's Five-Minute Veterinary Consult: Canine and Feline (6th ed.). Wiley-Blackwell.
4. Soave, O., & Brand, C. D. (1991). Coprophagy in animals: a review. Cornell Veterinarian, 81(4), 357-364.
5. Nijsse, R., Mughini-Gras, L., Wagenaar, J. A., & Ploeger, H. W. (2014). Coprophagy in dogs interferes in the diagnosis of parasitic infections by faecal examination. Veterinary Parasitology, 204(3-4), 304-309.