Why Does My Dog Eat Poop? Causes, Risks, and Health Implications

Dogs eat poop—a behavior called coprophagia—for reasons that range from normal instincts to serious health issues. Research shows that 38% of Border Collies and 40% of Shelties develop this habit, while vitamin B deficiencies and poor diets are also major contributors according to veterinary sources. Why Does My Dog Eat Poop?

Understanding whether your dog’s stool-eating stems from nutrition, stress, or an underlying medical condition is essential for their wellbeing. This article, Petflix and Chill covers the science behind coprophagia, breed predispositions, health risks, and actionable steps to address the behavior based on current 2026 veterinary guidance.

The Science of Coprophagia: Why Dogs Consume Feces

Health-Related Causes: Nutritional Deficiencies and Medical Conditions

Condition	How It Contributes to Coprophagia	Common Symptoms
Vitamin B Deficiency	Dogs may eat feces to obtain missing nutrients, particularly B vitamins, that their regular diet lacks.	Lethargy, poor coat condition, digestive issues
Underfeeding/Poor-Quality Food	Inadequate portion sizes or low-nutrient food drive dogs to seek alternative food sources, including stool.	Weight loss, constant hunger, low energy
Digestive Enzyme Deficiency	Lack of enzymes prevents proper digestion, causing dogs to consume feces to replenish these enzymes.	Gas, bloating, soft stools, nutrient malabsorption
Parasites (Worms)	Internal parasites cause malabsorption and increased appetite, prompting dogs to eat more, including feces.	Scooting, visible worms, pot-bellied appearance
Malabsorption Syndromes	Medical conditions that block nutrient uptake force dogs to seek nutrients from unconventional sources like poop.	Diarrhea, weight loss, vitamin deficiencies
Gastrointestinal Problems	IBD, pancreatitis, or other GI issues disrupt digestion and nutrient absorption, leading to compensatory stool-eating.	Vomiting, abdominal pain, irregular bowel movements

One of the most common health-related reasons for coprophagia is a nutritional imbalance or deficiency, as noted by veterinary partners. Some studies suggest that a vitamin B deficiency might lead some dogs to eat poop as a way to self-medicate missing nutrients. Underfeeding or eating a poorly digestible diet can also drive dogs to seek nutrients in feces, according to VetWest.

Poorly balanced dog diets contribute significantly to this behavior, and digestive enzyme deficiencies may cause dogs to eat poop to replenish what their body lacks. Parasites such as worms can lead to malabsorption and increased appetite, prompting stool consumption, while malabsorption syndromes prevent proper nutrient uptake, causing dogs to seek alternative sources. Any medical condition that causes malabsorption of nutrients can result in coprophagia.

Behavioral and Instinctual Triggers: Stress, Anxiety, and Natural Behaviors

Beyond medical issues, psychological and instinctual factors play a major role in why dogs eat poop. Eating feces can be a response to stress, boredom, or anxiety, particularly in dogs left home alone for long periods. This behavior often serves as a self-soothing mechanism for dogs who are stressed, nervous, or anxious.

Some dogs develop coprophagia as a symptom of Obsessive Compulsive Disorder (OCD), typically triggered by chronic stress, anxiety, or insufficient mental stimulation. Certain innate behaviors also contribute: mother dogs (dams) eat their puppies’ poop to keep the den clean, a natural instinct that can influence young dogs. Puppies may also consume their mother’s feces to acquire necessary gut flora for healthy digestion.

While poop eating may relate to survival instincts, it frequently stems from boredom, stress, or a craving for certain nutrients not met by their diet. Purina confirms in their 2026 guidance that coprophagy may stem from nutritional deficiencies or behavioral problems, highlighting the complex interplay between health and environment.

Breed and Age Risk Factors for Coprophagia

Breed Predispositions: Border Collies (38%) and Shelties (40%)

Research reveals significant breed predispositions for coprophagia. Studies show that 38% of Border Collies and 40% of Shelties have a history of eating poop—rates substantially higher than the average dog population. These breed-specific statistics suggest possible genetic or behavioral factors that make certain dogs more prone to this habit.

Border Collies and Shelties are both herding breeds known for their high intelligence, sensitivity, and energy levels. Their intense focus and potential for anxiety when under-stimulated may contribute to compulsive behaviors like stool-eating. However, it’s crucial to emphasize that any dog—regardless of breed—can develop coprophagia.

While these two breeds show notably higher incidence, the behavior appears across all types of dogs and should never be dismissed based on breed alone. Owners of predisposed breeds should be particularly vigilant about diet quality, mental stimulation, and stress management to prevent or address this behavior early.

Age and Lifestyle Risks: Puppies, Elderly Dogs, and Environmental Factors

• Puppies: Young dogs may eat their mother’s feces to acquire necessary gut flora for healthy digestion, a natural instinct that typically fades with age.
• Senior Dogs: Older dogs with cognitive decline, sensory loss, or digestive issues may develop coprophagia as a new behavior, often linked to age-related health changes.
• Dogs with Health Issues: Dogs suffering from fecal incontinence, digestive disorders, or malabsorption conditions may eat their own stool due to accidental soiling or nutrient cravings.
• Isolation/Long Alone Time: Dogs left home alone for extended periods frequently develop boredom-related coprophagia as a self-soothing activity to cope with loneliness.
• Multi-Dog Households: Healthy dogs sometimes consume feces from weaker, sick, or elderly dogs in the household, possibly as an instinct to clean or due to the smell of undigested nutrients.
• Stressful Environments: Dogs kept in isolation or experiencing major life changes (moving, new family members, loss of companion) are more likely to develop stress-induced coprophagia.

Age and lifestyle dramatically influence coprophagia risk. The American Kennel Club notes that sometimes a healthy dog will consume poop from a weaker dog in the household, especially in cases of fecal incontinence. Dogs kept in isolation are more likely to develop coprophagia as a self-soothing behavior, according to CareCredit.

The Royal Kennel Club emphasizes that if your dog is home alone for long periods, they may eat poop due to boredom or anxiety. Puppies observing their mother’s den-cleaning behavior may imitate it, while young animals eating their mother’s feces help establish proper gut flora—a natural process that usually resolves as they mature.

Why Does My Dog Eat Poop? Health Dangers: Parasites, Bacteria, and When to See a Vet

Is It Bad for My Dog to Eat Poop? Understanding the Risks

While coprophagia is a normal behavior in dogs and often relatively harmless, it carries significant health risks that make it worth discouraging. According to Vetster, eating poop is usually not immediately dangerous, but there is always the risk of parasites, viruses, and bacteria transmission. Feces can harbor harmful pathogens like Giardia, Salmonella, E. coli, and various worms that can infect your dog and potentially spread to humans in the household.

The risk increases when dogs consume feces from other animals, especially wildlife or unfamiliar dogs, as these may contain unknown parasites or diseases. Even feces from a healthy dog can contain parasites if that dog is infected.

Additionally, if your dog is on parasite preventive medication, eating poop could reduce its effectiveness or expose them to drug-resistant parasites. While the act itself is natural canine behavior from an evolutionary perspective, the modern environment introduces numerous health threats that make this habit undesirable for your pet’s long-term health.

When to Worry: Sudden Onset and Warning Symptoms

• Sudden Onset: If your dog suddenly starts eating poop when they’ve never done so before, this indicates a potential new health issue or environmental stressor.
• Lethargy: Unusual tiredness, lack of energy, or excessive sleeping paired with coprophagia suggests systemic illness.
• Weight Loss: Unexplained weight loss despite normal or increased appetite may signal malabsorption, parasites, or metabolic disorders.
• Vomiting: Frequent vomiting, especially if accompanied by stool-eating, points to gastrointestinal distress or infection.
• Diarrhea: Persistent diarrhea with coprophagia could indicate parasites, bacterial overgrowth, or inflammatory bowel disease.
• Other Behavioral Changes: Increased anxiety, withdrawal, aggression, or changes in drinking/urination patterns warrant investigation.

Veterinary experts consistently advise that if your dog suddenly starts eating poop when they haven’t before, or if it’s accompanied by symptoms like lethargy, weight loss, vomiting, diarrhea, or other behavioral changes, you should schedule an exam with your veterinarian immediately. These symptoms often indicate underlying medical conditions that require diagnosis and treatment, such as parasite infestations, hormonal imbalances, or gastrointestinal diseases.

Early intervention prevents complications and addresses the root cause rather than just the symptom. Don’t assume coprophagia is purely behavioral without ruling out health issues first, especially in adult dogs with no prior history of this behavior.

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The most surprising finding from current research is that 40% of Shelties—a breed not typically associated with unusual eating habits—develop coprophagia, a predisposition many owners never suspect. This highlights how breed genetics can influence behavior in unexpected ways.

For immediate action, consult your veterinarian about adding a digestive supplement with enzymes and a multivitamin containing B vitamins to address potential nutritional gaps driving the behavior. Additionally, review your dog’s diet quality and feeding schedule—sometimes simply increasing meal frequency or switching to a more nutrient-dense food can resolve the issue. For behavioral cases, increase mental stimulation through puzzle toys, training sessions, and adequate exercise to reduce boredom-driven stool consumption.

Resources like why does my dog stare at me and why does my dog lick me so much offer further insights into canine communication that can strengthen your bond and reduce anxiety-related behaviors. Remember, understanding the specific cause for your dog is key—what works for a bored puppy differs from treatment for a dog with parasites, so professional veterinary guidance is essential before trying any remedies.