Why Do Dogs Eat Feces and Can Safe Human Foods Help Stop It
Why do dogs eat feces? Learn the science behind coprophagia, which safe human foods may reduce the behavior, and when to consult your veterinarian.
Why Do Dogs Eat Feces? Understanding Coprophagia in Dogs
If you've ever caught your dog snacking on stool — their own, another dog's, or even a cat's — you're not alone. Coprophagia (the clinical term for feces-eating) affects an estimated 25% of dogs at some point in their lives, according to a widely cited study published in the Journal of the American Veterinary Medical Association. While the behavior is undeniably unpleasant for owners, it's rarely dangerous in and of itself. The real questions are: why does it happen, and can adjusting your dog's diet with safe human foods actually help?
This guide breaks down the veterinary science behind coprophagia, identifies safe human foods that may address nutritional or behavioral triggers, and gives you exact serving sizes, preparation steps, and red flags to watch for. If your dog has a persistent feces-eating habit, always consult your veterinarian to rule out underlying medical conditions before making dietary changes.
Adding specific nutrient-dense human foods (like plain canned pumpkin, cooked sweet potato, or pineapple) to your dog's diet can address some nutritional gaps and make stool less appealing. However, coprophagia has multiple causes — behavioral, environmental, and medical — and food alone won't solve every case. These foods are safe when prepared correctly and fed in the portions listed below.
The Science: Why Dogs Eat Feces
Research published in JAVMA by Dr. Benjamin Hart and colleagues at UC Davis found that coprophagia is most strongly associated with a dog's innate scavenging drive rather than nutritional deficiency alone. Key findings:
- Age factor: Puppies are more likely to engage in coprophagia, and many outgrow it by 12-18 months
- Greedy eaters: Dogs described as "greedy eaters" by their owners were significantly more likely to eat feces
- Household dynamics: Multi-dog households see higher rates, likely due to stool availability
- Freshness preference: Dogs overwhelmingly prefer stool less than 1-2 days old — an evolutionary holdover from keeping den areas clean
- Breed tendencies: Terriers, hounds, and retrievers show higher prevalence, though any breed can be affected
That said, veterinary professionals also recognize medical triggers that should be ruled out first:
| Condition | Mechanism | Prevalence in Coprophagic Dogs |
|---|---|---|
| Exocrine Pancreatic Insufficiency (EPI) | Pancreas fails to produce digestive enzymes; undigested nutrients in stool attract re-consumption | Low overall, but high correlation when present |
| Intestinal parasites (roundworms, hookworms, giardia) | Parasites steal nutrients, creating malabsorption and increased appetite | Moderate — common in puppies and unscheduled dogs |
| Cushing's disease (hyperadrenocorticism) | Excess cortisol drives polyphagia (extreme hunger) | Low, but coprophagia can be an early sign |
| Diabetes mellitus | Cells cannot utilize glucose; body signals constant hunger | Low-moderate in uncontrolled cases |
| Vitamin B deficiency | B-vitamin depletion from poor diet or malabsorption may drive stool-seeking | Anecdotal; limited controlled data |
Safe Human Foods That May Help Reduce Coprophagia
The following foods are safe for dogs and have either documented evidence or strong veterinary-anecdotal support for making stool less palatable or addressing nutritional gaps that contribute to the behavior. Each food includes exact serving sizes based on your dog's weight.
1. Plain Canned Pumpkin (Not Pie Filling)
Pumpkin is rich in soluble fiber, which improves stool consistency and digestive transit. Firmer, well-formed stools are less attractive to coprophagic dogs. Pumpkin also contains vitamin A (7,636 IU per cup, per USDA data), vitamin C, potassium (505 mg per cup), and iron.
2. Fresh Pineapple Chunks
Pineapple contains bromelain, a proteolytic enzyme that alters the protein composition of stool, making it taste worse to dogs. This is one of the most commonly recommended "stool deterrent foods" by veterinarians. Pineapple also provides vitamin C (79 mg per cup), manganese (1.5 mg per cup), and dietary fiber.
3. Cooked Sweet Potato
Sweet potato delivers complex carbohydrates, beta-carotene (converted to vitamin A), and B-vitamins that support overall digestive health. Its high fiber content (6.6 g per cup, cooked) helps produce firm, less-appealing stool.
4. Plain Unsweetened Yogurt or Kefir
Probiotic-rich foods support gut microbiome balance. A healthy gut reduces malabsorption issues that can drive coprophagia. Look for products with live active cultures (Lactobacillus acidophilus, Bifidobacterium). Greek yogurt provides approximately 15-20 g protein per cup and calcium (245 mg per cup).
5. Raw or Lightly Steamed Zucchini
Zucchini is low-calorie, high-fiber, and rich in vitamin C (22 mg per cup) and potassium (324 mg per cup). Its mild flavor blends easily into meals, and the added bulk improves stool quality.
Exact Serving Sizes by Dog Weight
| Food | Small Dogs (5-20 lb / 2-9 kg) |
Medium Dogs (21-50 lb / 10-23 kg) |
Large Dogs (51-90 lb / 23-41 kg) |
Giant Dogs (90+ lb / 41+ kg) |
|---|---|---|---|---|
| Canned pumpkin (plain) | 1-2 teaspoons/day | 1-2 tablespoons/day | 2-4 tablespoons/day | 4-5 tablespoons/day |
| Fresh pineapple chunks | 1-2 small pieces (½ inch cubes) | 3-4 pieces (½ inch cubes) | 5-6 pieces (½ inch cubes) | 8-10 pieces (½ inch cubes) |
| Cooked sweet potato (mashed) | 1-2 tablespoons | 2-4 tablespoons | ¼-½ cup | ½-¾ cup |
| Plain yogurt/kefir | 1 teaspoon | 1 tablespoon | 2 tablespoons | 3-4 tablespoons |
| Zucchini (chopped) | 1-2 tablespoons | 2-3 tablespoons | ¼ cup | ⅓-½ cup |
Important: These foods should supplement a complete and balanced diet — they should not exceed 10% of your dog's total daily caloric intake. For a 30 lb (14 kg) dog eating approximately 700-800 calories/day, treats and supplemental foods should stay under 70-80 calories.
How to Prepare These Foods Safely
- Canned pumpkin: Use ONLY 100% pure pumpkin purée (e.g., Libby's Pure Pumpkin). Check the label — pumpkin pie filling contains xylitol, nutmeg, and added sugars that are toxic or harmful to dogs. No cooking needed; serve straight from the can. Refrigerate opened cans and use within 5-7 days.
- Fresh pineapple: Remove the tough outer skin completely. Cut out the hard central core (choking hazard and difficult to digest). Cut flesh into ½-inch cubes. Serve raw — do not cook, as heat destroys bromelain. Avoid canned pineapple in syrup (excess sugar).
- Sweet potato: Must be cooked — raw sweet potato contains trypsin inhibitors that interfere with protein digestion and is difficult for dogs to chew. Bake at 400°F (204°C) for 45-60 minutes or boil until fork-tender. Remove skin (choking risk for small dogs). Mash or dice. No butter, salt, brown sugar, or marshmallows.
- Yogurt/kefir: Choose plain, unsweetened varieties only. Verify the label says "no added sugar" and check for xylitol (birch sugar) in the ingredient list — this sweetener is highly toxic to dogs. Full-fat or low-fat are both acceptable; avoid non-fat varieties with added thickeners. Greek yogurt has less lactose than regular yogurt, making it easier to digest.
- Zucchini: Wash thoroughly. Remove seeds from large zucchini (small zucchini seeds are fine). Can be served raw (grated or finely chopped) or lightly steamed for 3-4 minutes. No oil, garlic, onion, salt, or seasoning. Cut into bite-sized pieces appropriate for your dog's size.
What Happens If Your Dog Eats Too Much of These Foods?
Even safe foods cause problems when portion guidelines are ignored. Here's what to expect and when to act:
| Food | Overfeeding Symptoms | Toxic Threshold / Concern |
|---|---|---|
| Pumpkin | Loose stools, diarrhea, abdominal cramping | Excess vitamin A (hypervitaminosis A) possible if fed >1 cup/day long-term in small dogs |
| Pineapple | Diarrhea, stomach upset, elevated blood sugar | High sugar content (16 g per cup); diabetic dogs especially at risk |
| Sweet potato | Gas, bloating, loose stools, weight gain | High glycemic index; problematic for diabetic or overweight dogs |
| Yogurt/kefir | Bloating, gas, diarrhea (lactose intolerance) | Xylitol-containing brands are life-threatening — as little as 0.1 g/kg can cause hypoglycemia |
| Zucchini | Gas, mild diarrhea | Very low risk; cucurbitacin in bitter zucchini can cause vomiting (rare) |
How to Introduce These Foods Safely
Follow this protocol when adding any new food to your dog's diet:
- Day 1-2: Offer 25% of the recommended serving size. Mix into regular food.
- Day 3-4: If no vomiting, diarrhea, or itching occurs, increase to 50% serving.
- Day 5-7: Increase to full recommended serving if well-tolerated.
- Monitor: Watch stool quality, appetite, energy level, and skin condition for the full 7 days.
- One food at a time: Introduce only one new food per week so you can identify the cause if a reaction occurs.
Dogs Who Should NOT Eat These Foods
Some dogs need to avoid one or more of these foods entirely. Always consult your veterinarian before dietary changes if your dog falls into any of these categories:
- Diabetic dogs: Pineapple and sweet potato have high glycemic indices and can destabilize blood glucose. Avoid or feed only under veterinary guidance.
- Dogs with pancreatitis: Full-fat yogurt may trigger a flare-up. Use only fat-free or consult your vet.
- Dogs with kidney disease: Pumpkin and sweet potato are high in potassium; dogs on potassium-restricted diets should avoid them.
- Lactose-intolerant dogs: Approximately 65% of dogs have reduced lactase production after weaning. Yogurt and kefir contain less lactose than milk but can still cause issues in sensitive dogs.
- Puppies under 12 weeks: Digestive systems are still developing. Stick to puppy-formulated food and discuss supplements with your vet at the puppy wellness visit.
- Dogs on prescription diets: Adding supplemental foods can alter the carefully balanced nutrient ratios in veterinary therapeutic diets (e.g., Hill's Prescription Diet, Royal Canin Veterinary Diet, Purina Pro Plan Veterinary Diets).
Behavioral Strategies to Pair With Dietary Changes
Food adjustments alone rarely eliminate coprophagia completely. Pair dietary changes with these evidence-based, force-free management strategies:
- Immediate cleanup: Pick up stool within 2 minutes of elimination. The UC Davis study found dogs strongly prefer stool less than 24 hours old — removing it promptly eliminates the opportunity entirely.
- Leash supervision: Keep your dog on a 6-foot leash during potty breaks. Use positive reinforcement to reward them for turning away from stool. A high-value treat (small piece of cooked chicken, approximately 5 calories) immediately after elimination creates a competing behavior.
- Teach "leave it": Train a reliable "leave it" cue using positive reinforcement. Start with low-value items and gradually work up to practicing near stool (using fake setups with peanut butter on a paper towel, for example).
- Enrichment: Increase mental stimulation — puzzle feeders, snuffle mats, frozen Kongs. Boredom and understimulation are documented behavioral contributors to coprophagia.
- Cat litter box management: Cat feces are highly attractive to dogs due to their high protein content. Use a dog-proof litter box (top-entry designs like the Modkat or Modkat XL, $45-$90) or place the box behind a baby gate with a cat-sized opening.
When to Call Your Veterinarian
- Weight loss despite normal or increased appetite
- Chronic diarrhea or stool with visible mucus, blood, or worms
- Vomiting after eating feces
- Excessive thirst and urination (polydipsia/polyuria)
- Lethargy or decreased activity level
- Poor coat condition (dull, brittle, thinning fur)
- Coprophagia that begins suddenly in an adult dog who never exhibited the behavior before
- Any signs of distress, bloating, or abdominal pain after consuming stool
Your vet will likely recommend a fecal flotation test ($25-$45), a complete blood count and chemistry panel ($80-$200), and possibly a trypsin-like immunoreactivity (TLI) test for EPI ($60-$120). These diagnostics help rule out the medical conditions listed above.
If you suspect your dog has ingested a toxic substance along with feces (e.g., feces near areas treated with pesticides, or if the dog consumed another animal's medicated stool), contact the ASPCA Animal Poison Control Center at (888) 426-4435 (available 24/7, consultation fee applies).
Frequently Asked Questions
Can dogs eat feces without getting sick?
While coprophagia is unlikely to cause immediate illness in healthy dogs, it does expose them to parasites (roundworms, hookworms, whipworms, giardia), bacteria (E. coli, Salmonella, Campylobacter), and potentially parvovirus if consuming feces from an infected dog. Dogs who eat feces should be on a regular deworming schedule and have fecal tests performed at least twice annually.
How much pumpkin or pineapple can I give my dog to stop coprophagia?
Follow the serving size table above. For a 30 lb (14 kg) medium dog, that means 1-2 tablespoons of plain canned pumpkin daily or 3-4 half-inch pineapple chunks daily. Start at the lower end and increase gradually over 5-7 days. Results typically appear within 2-4 weeks of consistent feeding, though some dogs require additional behavioral intervention.
Is coprophagia a sign of nutritional deficiency?
It can be, but research from the UC Davis School of Veterinary Medicine suggests that most coprophagia is behavioral rather than nutritional. However, dogs fed poor-quality diets, dogs with malabsorption conditions (EPI, IBD), and dogs with heavy parasite burdens may eat feces to recover lost nutrients. A veterinary exam and bloodwork can determine whether a deficiency is present.
Are commercial stool deterrent products effective?
Products like For-Bid, NaturVet Coprophagia Deterrent, and Potty Mouth contain ingredients (often yucca schidigera extract, monosodium glutamate, or garlic) designed to make stool taste unpleasant. A 2018 review found these products have variable success rates — approximately 50-70% of owners report partial improvement. They work best when combined with the dietary additions and behavioral strategies outlined above. Expect to spend $12-$25 for a 60-day supply.
Will adding meat tenderizer (papain) to my dog's food help?
Meat tenderizer contains papain, a proteolytic enzyme similar to bromelain in pineapple. While some veterinarians have historically recommended this approach, dosing is imprecise and commercial meat tenderizers often contain added salt, garlic powder, or onion powder — all of which can be harmful to dogs. Fresh pineapple is a safer, more controlled source of a similar enzyme.
My dog eats cat poop from the litter box — is this different?
Cat feces are particularly attractive to dogs because cat food is high in protein and fat, and cats' shorter digestive tracts leave more undigested nutrients in their stool. The coprophagia triggers are similar, but the solution is primarily environmental management (dog-proof litter boxes, baby gates) rather than dietary modification of the dog. Also ensure your cat is healthy, as parasite-laden cat feces pose a significant transmission risk.
Disclaimer: This article provides educational information and does not replace professional veterinary advice. Always consult your veterinarian before making dietary changes, especially if your dog has existing health conditions or is on a prescription diet. Coprophagia can signal underlying medical issues that require diagnosis and treatment by a licensed veterinarian.
Tom Renshaw
All our authors care for dogs every day — read more of their work on the authors page.
