Why Is My Cat Eating Poop? Coprophagia Explained

By Dr. Zubair Khalid, DVM, MS, PhD ·

Why Is My Cat Eating Poop? Coprophagia Explained

If you are asking why would my cat eat poop, you are not alone, and you are not imagining it. Coprophagia (the medical term for eating feces) happens in cats for two broad reasons: a health problem that changes digestion or appetite, or a behavior pattern tied to stress, hunger, or environment. Most cases improve once the cause is identified and the litter box and diet are adjusted.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

  • Coprophagia is uncommon in adult cats compared with dogs, and it is more often reported in kittens who are exploring or copying their mother.
  • Parasites and intestinal disease are real possibilities. In one necropsy study, 17.79% of cats had gastrointestinal helminths, most commonly Dipylidium and Toxocara species [1].
  • Chronic gut inflammation can show up as pica, the eating of non-food items. In a review of 41 biopsied dogs and cats with pica and foreign bodies, 100% had histologic chronic enteritis [2].
  • Never punish the behavior. Punishment teaches your cat to hide the act, not to stop it, and it adds stress that can make things worse.
  • Start with a veterinary visit that includes a fecal test, a weight check, and a diet review before you try behavioral fixes alone.

Why Do Cats Eat Poop? Normal Reasons First

Before you assume something is wrong, know that some poop eating is normal in the animal world. Kittens learn a lot by mouth, and they may sample stool out of simple curiosity. Nursing queens also clean up after their kittens, which removes waste and can teach kittens that feces are something to be handled.

There is also evidence from other species that early exposure to feces shapes the immune system. In rabbits, pups that had access to their mother's feces in the first 15 days of life showed different expression of immune genes in the ileum at days 35 and 49, including genes for antimicrobial peptides, mucin, cytokines, and immunoglobulin A secretion. When that access was blocked, immune development was blunted [3]. This does not mean cats should eat poop, but it does show that early fecal exposure is not automatically abnormal in mammals.

Some cats eat feces because of hunger or because the food they eat is not being fully digested. If your cat seems hungry all the time, is losing weight, or has soft stool, that points toward a digestion problem instead of a habit.

Medical Causes to Rule Out

Parasites

Intestinal worms are a common finding in cats. In a study of 416 cats from southern Brazil, 17.79% had gastrointestinal helminths. Dipylidium species were found in 45.9% of the parasitized cats, and Toxocara species in 37%. Most of these cats had pale mucous membranes, and 28.3% were thin [1]. Worms can cause poor nutrient absorption, which may leave a cat hungry and more likely to eat stool. A fecal exam is the first step.

Malabsorption and Chronic Enteropathy

When the gut cannot absorb nutrients properly, a cat may eat more, lose weight, or develop pica. A 2025 review of 133 dogs and cats that had gastric foreign bodies removed found that 100% of the 41 animals that were biopsied had histologic chronic enteritis, and 80% had chronic gastritis. Helicobacter species were found in 49% of the biopsied animals and were linked to more severe gastric inflammation [2]. This matters because pica and coprophagia can be the first visible sign of a gut problem, long before vomiting or diarrhea shows up.

Diet and Digestive Health

Diet affects digestion in ways owners often overlook. Cats have unique digestive traits and are prone to gastrointestinal disorders, which is why functional diets that support digestion and nutrient absorption are being studied [4]. If your cat's food is hard to digest or the portion is too small, stool may contain undigested material that smells like food. A veterinarian can review the diet and suggest changes.

Urinary health is a separate issue, but it is worth knowing that diet strongly influences urinary pH and crystal formation. Controlled dietary acidification is used to prevent struvite stones, and U.S. reports show struvite stones have increased recently after decades of decline [5]. This is not a cause of coprophagia, but it is a reminder that what you feed affects many body systems.

Other Health Problems

Pain, dental disease, thyroid disease, and diabetes can all change appetite and eating behavior. Any cat that suddenly starts eating stool, especially an adult cat with no history of it, needs a full physical exam and lab work.

When Coprophagia Becomes a Problem

Occasional stool sampling by a curious kitten is usually harmless. It becomes a problem when it happens often, when your cat eats stool from other animals, or when it comes with other signs.

Watch for these patterns:

  • Weight loss or a thin body condition
  • Pale gums
  • Vomiting, diarrhea, or mucus in the stool
  • Increased appetite with no weight gain
  • Eating litter, plastic, string, or other non-food items
  • Scooting, straining, or changes in litter box habits

If your cat is straining or having trouble passing stool, see Cat Straining to Poop: Constipation or Something Worse?. If there is mucus but little stool, read Cat Straining to Poop but Only Passing Mucus: Causes and Care. If your cat is not producing stool at all, Cat Not Pooping but Eating Normally: Causes and When to Help covers what to do next.

What to Do Step by Step

Step 1: Book a Veterinary Visit

Your veterinarian will ask about diet, litter box habits, weight changes, and other pets in the home. Expect a fecal flotation or similar test for parasites, a weight and body condition score, and possibly blood work. If the exam points to gut disease, your veterinarian may recommend further testing or a diet trial.

Step 2: Clean the Litter Box More Often

The single most effective behavioral fix is to remove stool before your cat can eat it. Scoop at least twice a day, and more often if you have multiple cats. A clean box also lowers stress and reduces the chance your cat will avoid the box, which can lead to accidents elsewhere. If your cat is already going outside the box, see Why Is My Cat Pooping Outside the Litter Box? Causes and Solutions.

Step 3: Review the Diet With Your Veterinarian

Ask whether your cat's food supports good digestion and whether the portion size matches your cat's weight and life stage. If your cat is always hungry, a diet change or a measured feeding plan may help. Do not switch foods suddenly. Transition over several days to avoid stomach upset.

Step 4: Add Enrichment

Boredom and stress can drive repetitive behaviors. Try food puzzles, scheduled play sessions with a wand toy, and vertical space like cat trees or shelves. Rotate toys so they stay interesting. A tired, engaged cat is less likely to fixate on the litter box.

Step 5: Manage Multi-Cat Households

If one cat eats another cat's stool, separate the boxes and scoop immediately. Some cats guard boxes, so provide one box per cat plus one extra, placed in different rooms. This reduces competition and gives each cat a clean place to go.

Step 6: Consider a Litter Box Additive or Covered Box

Some owners find that a covered box or a box with a hood reduces access, but covered boxes can trap odor and cause some cats to avoid them. Watch your cat's behavior. If your cat stops using the box, remove the cover.

Step 7: Keep a Simple Log

Write down when the behavior happens, what your cat ate that day, and whether stool looked normal. This log helps your veterinarian spot patterns and decide whether the cause is medical or behavioral.

What Not to Do

Do not punish your cat. Yelling, spraying, or tapping your cat does not teach the right behavior. It teaches your cat to eat stool when you are not looking, and it can damage your relationship and raise stress.

Do not use home remedies or human medications. Some human dewormers and supplements are toxic to cats. Your veterinarian calculates any dose from your cat's weight and health, so never guess.

Do not assume it is just a bad habit. In cats, coprophagia is often a sign that something else is going on. Ruling out parasites and gut disease is the fastest path to a real solution.

Do not rely on myths. There is no evidence that cats eat poop because they are "missing nutrients" in a simple sense, or because they are trying to clean up. Those ideas are not well established in veterinary research.

Do not ignore other symptoms. If your cat is not eating, that is a separate and urgent concern. Read Why Is My Cat Not Eating? A Vet-Reviewed Guide for Pet Owners.

When to Involve a Veterinarian or Behavior Professional

Call your veterinarian if the behavior is new, frequent, or paired with weight loss, vomiting, diarrhea, or changes in appetite. A fecal test and physical exam are the first steps.

Ask for a referral to a veterinary behaviorist or a certified applied animal behaviorist if your cat has been medically cleared and the behavior continues. These professionals can build a behavior plan that fits your home.

If your cat eats stool from other animals, especially outdoor cats or wildlife, the risk of parasites and infectious disease goes up. Keep your cat indoors and keep the litter box clean.

Limitations and When to Contact a Veterinarian

This article cannot tell you what is causing your cat's behavior. Individual cases need a veterinarian who can examine your cat, run tests, and review the diet.

Contact your veterinarian the same day if your cat:

  • Eats stool and then vomits or refuses food
  • Has pale gums, weakness, or collapse
  • Has bloody diarrhea or black stool
  • Shows pain when you touch the belly
  • Has a swollen or hard abdomen

Go to an emergency clinic now if your cat:

  • Is straining to poop with no stool produced
  • Is vomiting repeatedly and cannot keep water down
  • Is breathing fast or open-mouth breathing
  • Collapses or has a seizure

Schedule a routine visit within a few days if your cat:

  • Starts eating stool as an adult with no prior history
  • Has soft stool, gas, or weight loss
  • Is always hungry
  • Eats litter or other non-food items

If you suspect your cat ate something toxic, call your veterinarian or a pet poison control hotline right away. Do not wait for symptoms.

Frequently Asked Questions

Is my cat eating poop a sign of a nutrient deficiency?

Not usually. In cats, coprophagia is more often linked to parasites, gut inflammation, hunger, or behavior than to a simple missing nutrient. A veterinarian can check for malabsorption and review the diet before you add supplements.

Why is my kitten eating poop?

Kittens often explore with their mouths, and some learn the behavior from their mother, who cleans up after them. It can also mean the kitten is hungry or has worms. A fecal test and a weight check are the first steps.

Why is my kitten eating her poop?

A kitten eating her own poop may be copying normal maternal behavior or simply experimenting. If it happens often, or if she is thin or has soft stool, have her checked for parasites and digestive problems.

Can stress cause a cat to eat poop?

Stress and boredom can drive repetitive behaviors, including coprophagia. Multi-cat tension, a dirty litter box, or a recent move can all play a role. More enrichment and cleaner boxes often help.

Will my cat outgrow eating poop?

Some kittens stop as they mature, especially if the litter box is kept clean and they are healthy. Adult cats that start the behavior usually need a veterinary workup. If it continues after medical causes are ruled out, a behavior plan can help.

Related Articles

References

  1. Gastrointestinal helminthiases associated with cause of death in dogs and cats from southern Brazil. Veterinary parasitology, regional studies and reports, 2026.
  2. Pica as a clinical sign of a chronic enteropathy in dogs and cats. Journal of the American Veterinary Medical Association, 2025.
  3. Coprophagia in early life tunes expression of immune genes after weaning in rabbit ileum. Scientific reports, 2024.
  4. The effects of Sijunzi decoction-supplemented cat food on physiological parameters and gut microbiota in healthy adult cats. Frontiers in veterinary science, 2025.
  5. Revisiting feline urinary tract health: the role of diet and acidifying agents in urolith prevention and long-term cat health. Journal of animal science, 2026.

Further Reading