Why Do Dogs Eat Their Own Poop? Causes, Fixes & Breed Risks

Why Dogs Eat Their Own Poop: Understanding Coprophagia

If you've caught your dog snacking on feces — their own or another animal's — you're not alone. Coprophagia, the clinical term for stool-eating behavior, affects an estimated 16% of dogs according to a study published in the Applied Animal Behaviour Science journal. While it's one of the most reviled canine habits, understanding why it happens is the first step toward stopping it.

As someone who has counseled hundreds of dog owners through this issue, I can tell you that coprophagia is rarely caused by a single factor. It's usually a combination of behavioral drives, environmental conditions, and sometimes underlying nutritional or medical issues. Let's break down exactly what's going on and what you can actually do about it.

Is Coprophagia Normal or a Sign of Something Wrong?

The short answer: it can be either. Mother dogs naturally consume their puppies' feces during the first three weeks of whelping to keep the den clean and reduce predator scent. This maternal coprophagia is entirely normal and typically resolves on its own.

However, when adult dogs persistently eat feces beyond puppyhood, it warrants investigation. The Merck Veterinary Manual categorizes coprophagia into three types:

• Autocopphagia: Eating one's own feces
• Allocoprophagia: Eating feces of other dogs
• Heterocoprophagia: Eating feces of other species (cats, horses, rabbits)

Each type may have different underlying drivers, and treatment strategies can vary accordingly.

Medical Causes: When Stool-Eating Signals a Health Problem

Before addressing this as a behavioral issue, rule out medical causes with your veterinarian. Several conditions can trigger or exacerbate coprophagia:

Conditions Linked to Coprophagia

Always consult your veterinarian for proper diagnosis. These conditions require medical treatment, and coprophagia will typically resolve once the underlying disease is managed.

Nutritional Deficiencies and Diet-Related Causes

One of the most commonly cited — and often misunderstood — reasons for coprophagia is nutritional deficiency. Here's what the evidence actually shows:

Thiamine (Vitamin B1) Deficiency

Thiamine is critical for carbohydrate metabolism. Dogs on diets high in raw fish (which contains thiaminase, an enzyme that destroys thiamine) or heavily processed, improperly stored kibble may develop deficiencies. Feces from a thiamine-deficient dog may still contain appealing undigested compounds, driving the behavior.

Enzyme Deficiency

Dogs with insufficient digestive enzymes may pass partially digested food in their stool, making it smell and taste like food to the dog. This is particularly common in breeds predisposed to EPI, such as German Shepherds and Rough Collies.

Underfeeding

Dogs on calorie-restricted diets or those fed below their metabolic needs may resort to eating feces to fill caloric gaps. This is especially common in high-energy working breeds or dogs in multi-pet households where food competition exists.

The Kibble Connection

Some veterinary behaviorists have noted that dogs fed highly processed, low-quality kibble with excessive filler content may produce stools that still contain undigested carbohydrates and fats, making them more palatable to the dog. Switching to a higher-quality, AAFCO-certified diet with named protein sources as the first ingredient can reduce — though not always eliminate — the behavior.

Behavioral and Environmental Drivers

For the majority of dogs with coprophagia, the root cause is behavioral rather than medical. The 2018 study in Applied Animal Behaviour Science found that dogs who ate feces were more likely to be described as "greedy eaters" and were more frequently found in households where they had access to feces regularly.

Key Behavioral Factors

• Attention-seeking: If you react strongly (chasing, yelling) when your dog eats feces, the behavior may be reinforced by the attention, even negative attention.
• Anxiety and stress: Dogs in high-stress environments, those recently rehomed, or dogs with separation anxiety may engage in coprophagia as a displacement behavior.
• Confinement: Dogs kept in small, under-enriched spaces (crates for excessive periods, small runs) are more likely to eat feces out of boredom.
• Learned behavior: Puppies who observe their mother or another dog eating feces may mimic the behavior.
• Fear of punishment: Dogs who have been punished for house-soiling may eat their feces to "hide the evidence."
• Prey drive/scavenging instinct: Some dogs, particularly those with strong hunting lineage (hounds, terriers, spaniels), have an innate drive to investigate and consume novel items, including feces.

Breed Predispositions

While any breed can develop coprophagia, some breeds appear more frequently in clinical reports:

Health Risks of Coprophagia

While eating one's own feces is generally low-risk for a healthy dog (the bacteria and parasites present are already in the dog's system), consuming feces from other animals introduces significant health hazards:

• Parasite transmission: Roundworms, hookworms, whipworms, and Giardia can all be transmitted through fecal ingestion. The CDC notes that hookworm larvae can penetrate skin or be ingested, making coprophagic dogs a zoonotic risk to their owners.
• Viral exposure: Parvovirus and canine coronavirus can survive in feces for weeks in the environment. A dog eating feces from an infected dog is at high risk of contracting these diseases.
• Bacterial infections: Salmonella, E. coli, and Campylobacter are commonly found in feces and can cause severe gastroenteritis.
• Toxin ingestion: If another animal has ingested a toxic substance (rodenticide, toxic plants, xylitol), residual toxins may be present in their feces. If you suspect your dog has ingested feces containing toxins, contact the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies).
• Medication residue: Feces from animals on medications (heartworm preventives, NSAIDs, chemotherapy drugs) may contain drug metabolites that could harm your dog.

Proven Strategies to Stop Dogs From Eating Poop

There is no single magic fix for coprophagia. The most successful approach combines environmental management, dietary adjustment, and positive reinforcement training. Here's a decision framework based on what I've seen work consistently:

Step 1: Environmental Management (Immediate)

Remove the opportunity. This means:

• Pick up feces immediately after your dog eliminates — within 30 seconds if possible
• Use a leash during potty breaks to maintain control and redirect
• Keep litter boxes inaccessible (use baby gates or top-entry boxes for cats)
• Supervise yard time and clean the yard at least daily
• Consider a basket muzzle during walks if your dog targets other dogs' feces (use only during walks, never as extended wear)

Step 2: Dietary Interventions

Step 3: Positive Reinforcement Training

Train an incompatible behavior using force-free methods:

1. Teach "Leave It": Start with low-value items on the ground. Reward your dog for looking away. Progress to higher-value items. Never use punishment or aversive tools like shock collars.
2. Teach "Come" After Elimination: Immediately after your dog finishes pottying, call them to you and reward with a high-value treat (freeze-dried liver, chicken). This creates a habit of coming to you rather than turning around to investigate.
3. Counter-Conditioning: Pair the post-potty moment with something your dog loves more than feces — a favorite toy, a training game, or a food puzzle.
4. Enrichment: Increase mental stimulation through puzzle feeders, snuffle mats, scent work, and training sessions. Boredom-driven coprophagia often decreases significantly with proper enrichment.

Step 4: Address Underlying Anxiety

If coprophagia is stress-related, consider:

• Increasing daily exercise (minimum 30-60 minutes of structured activity for most breeds)
• Using Adaptil (dog-appeasing pheromone) diffusers or collars
• Consulting a certified veterinary behaviorist (DACVB) or a fear-free certified trainer
• Discussing anti-anxiety medication with your veterinarian for severe cases — SSRIs like fluoxetine (Prozac) or TCAs like clomipramine may be appropriate

What Doesn't Work: Common Myths Debunked

Several commonly recommended "fixes" have little to no evidence behind them:

• Feeding raw zucchini or broccoli: While these are safe vegetables, there's no clinical evidence they deter coprophagia.
• Rubbing feces on the dog's nose: This is both ineffective and potentially harmful — it can increase anxiety and doesn't create a negative association with eating stool.
• Punishment or yelling: Aversive methods often make coprophagia worse by increasing stress or teaching the dog to eat feces faster before you can intervene.
• Hot sauce or bitter sprays on feces: Inconsistent results and can cause oral irritation or GI upset.

Frequently Asked Questions About Coprophagia

Is it dangerous for my dog to eat their own poop?

Eating their own feces (autocopphagia) is generally low-risk for healthy dogs, as the bacteria present are already part of their gut flora. However, it can reintroduce parasite eggs if your dog has an active infestation, and it's unsanitary — particularly concerning if your dog licks your face or hands afterward. The bigger risk comes from eating other animals' feces, which can transmit parasites, viruses, and bacteria.

Will my puppy grow out of eating poop?

Many puppies engage in coprophagia during the oral exploration phase (roughly 3-6 months of age) and stop as they mature. However, the 2018 Applied Animal Behaviour Science study found that dogs who continue the behavior past their first year are likely to persist without intervention. Don't wait it out — start management and training early.

Can I use a muzzle to stop coprophagia?

A basket muzzle (such as the Baskerville Ultra or Jafco Clear Vinyl muzzle) can be a useful management tool during walks to prevent feces consumption. However, it should only be used during supervised walks and never left on for extended periods or used as the sole solution. Combine muzzle use with training to address the underlying behavior.

Are there any medications that can help?

There is no FDA-approved medication specifically for coprophagia. However, if the behavior is driven by anxiety, your veterinarian may prescribe anti-anxiety medications. For EPI-related coprophagia, pancreatic enzyme replacement therapy (PERT) with products like Pancrezyme typically resolves the behavior. Always consult your veterinarian before starting any medication.

My dog only eats cat poop from the litter box — how do I stop this?

Cat feces are particularly appealing to many dogs due to the high protein content in cat food, which passes through into the stool. Management is key: use a top-entry litter box, install a baby gate with a cat-sized opening, place the litter box behind a door with a pet door flap sized for your cat only, or use a covered litter box with a small entrance. Products like the Litter-Robot automatic self-cleaning box can also reduce the window of opportunity.

How long does it take to stop coprophagia with training?

With consistent environmental management and positive reinforcement training, most owners see significant improvement within 3-4 weeks. Complete resolution may take 6-8 weeks or longer, especially if the behavior has been established for months or years. Setbacks are normal — if your dog has access to feces during the training period, it will reset progress. Consistency in cleanup and reinforcement is non-negotiable.