Why Do Dogs Eat Poop? Coprophagia Explained

Why do dogs eat poop? The Coprophagia habit that science can explain, from ancestral instinct and hidden health issues to how to manage it correctly without punishment.

I know the feeling: your heart sinks as you watch your beloved dog stroll over and start eating "poop" right in front of you. I completely understand that it looks shocking and, well, disgusting. But please take a breath first, because this behaviour has a proper scientific name, "Coprophagia," and behind it lie both ancestral instincts and hidden health issues that science can actually explain.

In 1 Minute

Coprophagia is the behaviour of dogs eating faeces, and it is more common than you might think, research found that around 1 in 4 dogs have eaten poop at least once.
In healthy dogs, the cause is often ancestral instinct to protect the pack from parasites, imitating the mother, stress, or boredom.
In puppies it is considered normal and usually disappears on its own after around 9 months of age.
But if an "adult" dog suddenly starts eating poop, it can be a warning sign of a health problem such as parasites, malabsorption, or an underlying disease.
Fixing it must start with "finding the cause," then adjusting nutrition, managing the environment, and using positive reinforcement.
The one thing you must never do is harsh punishment, because it only makes the dog more anxious and more likely to eat in secret.

The Statistics: What Does the Research Tell Us?

Dr. Benjamin Hart of the University of California, Davis, studied this behaviour in depth and found some fascinating data that helps us understand our dogs better. Journal of Veterinary Behavior.

16% (or 1 in 6) of dogs were classed as "serious poop eaters," meaning they had been caught doing it at least 5 times.
24% (or 1 in 4) of the dogs in the study had been seen eating poop at least once.
A strange truth: dogs tend to eat only "fresh" stool (no more than 1–2 days old), and dogs that are greedy or like to steal food off the table are more likely to be poop eaters than others.
While the other study found that coprophagy does not appear to be related to environment, lifestyle, physical activity, anxiety, type of food, nutritional status, or reproductive status. Coprophagic behavior may be influenced by the presence of a coprophagic cohabitant. Journal of Veterinary Behavior

Why Do Dogs Eat Poop? (Natural and Behavioural Causes)

In healthy dogs, this behaviour usually is not caused by a physical abnormality, but rather by the following reasons.

Ancestral instinct: Dr. Hart concluded that this is an inherited trait meant to protect the pack, wild dogs would eat stool around the den to clear parasites and stop them spreading to other pack members.
Mother and puppy behaviour: A mother dog licks and eats her puppies' stool to keep them clean during the first 3 weeks, while puppies tend to copy her behaviour or eat it to explore the world, which mostly fades on its own after about 9 months.
Stress and environment: Dogs confined in cramped spaces or left alone for long periods are more likely to eat poop than usual.

When the Behaviour Comes From Stress or Incorrect Training

Training anxiety: If an owner uses harsh punishment during potty training, the dog may eat poop to "destroy the evidence" out of fear of being punished. Starting off the right way matters a lot, read more in puppy training tips.
Attention seeking: The dog learns that doing this makes the owner react (even if that reaction is scolding).

When Should You See a Veterinarian?

If an "adult" dog that never did this suddenly starts eating poop, I recommend bringing them in for a check-up, because it may stem from a hidden physical problem such as:

Intestinal parasites or malabsorption issues, regular parasite prevention helps lower the risk, see more guidance in parasite prevention
Nutritional deficiency: the body tries to replace minerals or B-vitamins.
Underlying disease: such as diabetes, Cushing's disease, or thyroid problems that abnormally increase appetite.

An adult dog that suddenly starts eating poop should always have a stool test or blood test first, to screen for physical disease before you begin any behaviour modification.

How to Manage and Fix It Effectively

Solving the problem means focusing on the "cause," not just stopping the symptom. If you find your dog doing this, try following these steps.

1. Rule Out Medical Issues

Before starting any training, consult your veterinarian for a stool or blood test to confirm your dog has no parasites, no abnormal nutrient absorption, and no metabolic disease.

2. Adjust the Diet

Make sure the food you provide is complete and high quality, see guidance in feeding your dog a healthy diet.
For dogs with malabsorption, supplementing digestive enzymes helps the body use nutrients better and reduces the urge to eat other things instead.

3. Environmental Management

Cleanliness: remove stool from the living area immediately to cut off access.
Close supervision: while walking or letting your dog run, keep watch at all times, and if they start showing interest in waste, redirect their attention right away.

4. Positive Reinforcement Techniques

Using rewards helps encourage desirable behaviour. One effective method is training the "Leave It" command:

Place a treat in your hand and offer it to your dog.
When they go to grab it, say "Leave It" and close your hand.
When they stop trying and look away, reward them with "a tastier treat" from your other hand.
Practise repeatedly until you can place items on the floor, then move the training outdoors.

5. Enrichment and Exercise

Bored dogs tend to find trouble to cure their boredom. Enough exercise and the use of puzzle feeders stimulate both the brain and body, reducing the chance of unwanted behaviour.

6. Manage Stress and Anxiety

If the cause is stress, you may need behaviour modification (desensitization), or in severe cases the vet may consider anti-anxiety medication alongside training.

What to Avoid

Punishment: scolding or hitting your dog for eating poop does not make the behaviour go away, it only makes them more stressed and anxious, which can lead to secret eating to destroy the evidence.
Ignoring the real cause: fixing only the symptom without addressing health or environment lets the behaviour come back again.

1. Scientifically, why do dogs eat their own or other animals' faeces?

This behaviour has the scientific name Coprophagia, and its main causes are ancestral instinct to protect the pack from spreading parasites, along with imitation behaviour in puppies. Research also found that greedy dogs tend to eat only fresh stool. However, if it appears in an adult dog that suddenly starts doing it, it may be a warning sign of accumulated stress, attention seeking, or a nutritional deficiency.

2. When an adult dog suddenly starts eating faeces, which health problems could it signal?

If this behaviour appears suddenly in a grown dog, it may indicate a physical health problem such as intestinal parasites or abnormal nutrient absorption that leaves the body deficient, or an underlying disease that abnormally raises appetite such as diabetes, Cushing's disease, or thyroid problems, as well as side effects from steroid medication. Owners should therefore take their dog to the vet to screen for physical disease first.

3. How should owners modify their dog's behaviour to fix this problem?

It has to be done on several fronts at once. Start with environmental management by removing stool immediately and adding activities to relieve boredom, then train the Leave It command using positive reinforcement, such as giving treats or praise when the dog walks past stool without interest. The key caution is to never scold or harshly punish, because stress only pushes the dog to eat in secret to destroy the evidence even more.

4. Should I worry about poop-eating in puppies?

Generally, in puppies this is considered natural, both from imitating the mother and from exploring the world around them, and it usually fades on its own after around 9 months of age. That said, you should keep things clean and stay on top of regular deworming. If the behaviour persists or comes with other abnormal signs, you should consult your veterinarian.

References

COAPE. Understanding Coprophagia: Causes and Solutions for Your Pet. coape.org
Hart, B. L., & Hart, L. A. (2018). “Why Do Dogs and Puppies Eat Feces? Coprophagy Explained.” Journal of Veterinary Behavior.
Landsberg, G., Hunthausen, W., & Ackerman, L. (2013). Behavior Problems of the Dog and Cat. Elsevier.
Amaral, A.R. et al. (2018). Canine coprophagic behavior is influenced by coprophagic cohabitant. Journal of Veterinary Behavior

Written by Dr. Monticha Kitnitchee

Coprophagia: Why Do Dogs Eat Poop? The Gross Habit Science Can Explain