Coprophagia — the technical term for a dog eating feces — is one of the most common behavior complaints vets hear, and also one of the most misunderstood. The short answer: it’s almost always behavioral, not a sign your dog is “missing something” in their diet. A widely cited 2012 survey of over 3,000 dogs by veterinary behaviorist Dr. Benjamin Hart at UC Davis found no link between coprophagia and diet, training method, or health status in the vast majority of cases — it’s simply a common, largely instinctual behavior that some dogs do and most grow out of.
That doesn’t mean it’s always harmless to ignore, or that there’s nothing you can do. Here’s what’s actually going on and when it’s worth a vet visit.
The Real Reasons Dogs Eat Poop
It’s instinctual for mother dogs — and some of that wiring sticks around. Nursing mothers clean up after their puppies by ingesting waste to keep the den area clean and free of scent that could attract predators. Puppies raised in that environment sometimes carry the behavior into adulthood, especially if they were weaned early or came from a shelter or hoarding situation where waste wasn’t managed.
Puppies explore the world with their mouths. Many puppies go through a phase of eating feces (their own or littermates’) simply as part of general oral exploration, the same way they chew shoes and furniture. Most grow out of it by 9–12 months with consistent management.
Stress, anxiety, and confinement. Dogs kept in small spaces for long periods, or those with separation anxiety, sometimes develop coprophagia as a stress behavior. If your dog is showing other anxiety signs — destructive behavior, excessive barking, or pacing when left alone — it’s worth reading through the fuller picture in our guide on separation anxiety in dogs, since the fix usually addresses more than just this one symptom.
Attention-seeking or a learned habit. If a dog gets a big reaction — even a negative one — every time they go near feces, some dogs learn that this reliably gets them attention and repeat it.
Boredom and understimulation. Dogs left alone in a yard for long stretches with nothing to do will sometimes eat feces the same way they’ll dig holes or bark at nothing: because there’s nothing better to do. This is closely related to why some dogs graze on grass out of boredom or mild stomach upset — see our piece on why dogs eat grass for the overlap.
Eating cat feces specifically. This deserves its own mention because it’s extremely common and has a different, more straightforward explanation: cat food is high in protein and fat, which makes cat feces smell appealing to dogs regardless of any behavioral issue. If your dog has access to a litter box, this is usually the simplest explanation and the easiest one to fix — a covered box or a baby gate solves it in most households.
When It’s Actually a Medical Issue
Diet-related and medical causes are less common than the instinctual and behavioral ones above, but they’re real and worth ruling out, especially if the behavior starts suddenly in an adult dog with no history of it:
- Malabsorption or maldigestion disorders, including exocrine pancreatic insufficiency, which leave nutrients in the stool that make it more appetizing to the dog.
- Intestinal parasites, which can increase appetite generally and sometimes drive scavenging behavior.
- Underlying conditions that increase appetite, such as Cushing’s disease or diabetes — worth considering if coprophagia shows up alongside increased hunger, thirst, or weight changes.
- Nutrient-poor or low-quality diets in rare cases, though the Hart survey found this to be a much smaller factor than popular belief suggests.
A sudden onset in an older dog, especially paired with other new symptoms, is a stronger signal for a medical workup than a longstanding habit in a young dog.
How to Stop It
- Clean up promptly. The single most effective intervention is removing the opportunity — pick up feces from the yard immediately and don’t leave your dog unsupervised in areas with accessible waste.
- Teach a reliable “leave it.” This gives you a tool to interrupt the behavior in the moment rather than just reacting after the fact.
- Manage litter box access if you have a cat in the house — a covered box, a cat-only room with a baby gate, or an elevated box out of the dog’s reach.
- Increase physical and mental enrichment. Puzzle feeders, more structured walks, and training sessions reduce the boredom-driven version of this behavior.
- Don’t punish after the fact. Dogs don’t connect delayed punishment to the act, and scolding can actually increase anxiety-driven coprophagia rather than reducing it.
- Ask your vet about taste-aversion products if management alone isn’t working — these are food additives that make stool less palatable, though evidence on effectiveness is mixed and they only work if every animal in the household producing waste is on them.
When to See a Vet
Coprophagia on its own, in an otherwise healthy dog, usually isn’t an emergency — but book a vet visit if you notice any of the following:
- The behavior starts suddenly in an adult dog with no prior history
- It’s paired with weight loss, increased appetite, or changes in stool consistency
- Your dog seems to have an increased appetite generally, not just around feces
- You suspect intestinal parasites (your vet can run a fecal exam to check)
- The behavior is frequent enough that you’re worried about parasite transmission or GI upset from ingesting another animal’s waste
A basic fecal exam and bloodwork rules out the medical causes quickly, which is worth doing before assuming it’s purely behavioral — especially since the fix is different depending on the cause.
The Practical Takeaway
Most coprophagia is instinctual, boredom-driven, or a simple case of a dog finding cat feces appetizing — not a sign of poor nutrition or bad training. Manage the environment first (prompt cleanup, litter box access, enrichment), rule out medical causes if it starts suddenly or comes with other symptoms, and skip the guilt — this is one of the most common and least well-understood behaviors in dogs, and it’s rarely a reflection of anything you’re doing wrong.