Why does your dog eat poop?
Coprophagia — the technical term for it — is gross, common, and rarely a medical problem on its own. About 1 in 6 dogs do it regularly, and most of them are perfectly healthy. The good news: it is one of the more fixable behaviour problems, and not for the reasons most owners try first.
It is normal, and mostly fixable.
A 2018 UC Davis survey by Dr Benjamin Hart — the largest of its kind — found that roughly 16% of dogs are serious stool eaters and a quarter have been caught at least once. The most reliable predictors were not diet or breed. They were opportunity and reinforcement.
The popular theories online — nutrient deficiencies, bad kibble, mineral cravings — have weak support in the literature. The fixes that work, supported by AKC, VCA, Cornell, and the Hart paper itself, are management, training, and time.
Six reasons, from likely to rare.
The first three account for the majority of cases. The last one is small but the one your vet wants to hear about if it fits.
- 01
Inherited canine behaviour
Mother dogs eat their puppies' stool to keep the den clean and hide the scent from predators. The behaviour is wired in. Many dogs simply never fully grow out of it, especially if the early environment didn't require it to fade.
- 02
It tastes interesting to them
This is the part owners most resist hearing. Frozen stool in winter, cat litter box contents, undigested protein in another dog's stool — to a dog, these read as food-adjacent. Disgust is a human concept; dogs did not get the memo.
- 03
Boredom and idle time
Dogs in long kennel stays, in single-dog yards with little stimulation, or alone for long workdays show higher rates. The behaviour fills time. The fix is usually time, not chemistry.
- 04
Reinforcement loop
A dog grabs poop on a walk, the owner rushes over, the dog runs, the owner chases. From the dog's perspective, this is a fantastic game. Many cases get worse because the reaction is more interesting than the act.
- 05
Stress, anxiety, or fear
Dogs sometimes eat their own stool to "hide the evidence" after being scolded for accidents. Punishment-based housetraining is a quiet driver of this behaviour, and it is one of the cleanest ones to fix at the cause.
- 06
Genuine medical issue (small share)
Malabsorption disorders, exocrine pancreatic insufficiency, parasitism, and certain endocrine conditions can drive a sudden, late-life onset. This is the smallest slice of the pie but the one that matters most when it applies.
Habit, or hint of something else.
Manage and move on.
- Long-standing habit since puppyhood
- Caught only occasionally, when supervision lapses
- No weight loss, no GI symptoms, no behaviour change
- Normal appetite for actual food
- Stool quality (consistency, colour) is normal
Worth a vet visit.
- New onset in an adult dog with no prior history
- Weight loss, ravenous hunger, or visible ribs
- Loose stool, mucus, blood, or persistent diarrhoea
- Visible worms in stool or around the rear
- Lethargy or behaviour change alongside the eating
- Eating cat stool (parasite/Toxoplasma exposure risk)
What you can do this week.
Forget the supplement aisle for a minute. The three interventions with the best evidence are environmental.
- 01
Pick it up immediately
The single most effective intervention. No stool means no opportunity. Walk the yard before letting the dog out, and carry bags on every walk so the window between deposit and ingestion stays at zero.
- 02
Block access to the cat box
Baby gate, covered box with a cat-only entry, or relocate to a level the dog cannot reach. Cat stool is the highest-risk source for parasite transmission and the highest-value target for most dogs.
- 03
Train a strong "leave it"
Reps with low-value items first, building up to high-value targets like stool. The cue is more reliable than any topical bitter spray, and it generalises to socks, dropped pills, dead birds, and every other off-limits find.
- 04
Cut the reaction
When you see your dog eyeing stool on a walk, calmly redirect with a happy cue and a treat. No yelling, no chase. The dog should learn that you become interesting near stool, not that stool becomes more interesting because of your reaction.
- 05
Audit the schedule and the boredom
More walks, more sniff time, food puzzles, training reps, a flirt pole session. Coprophagia in adult dogs is often a symptom of an empty day. Fix the day, fix the symptom.
Mistakes that make it worse.
- Adding pineapple, meat tenderizer, or pumpkin to "make stool unpalatable" — rarely effective in studies
- Yelling, scaring, or rubbing the dog's nose in stool
- Switching foods repeatedly searching for "the right one"
- Letting the dog into the cat box "just for now"
- Assuming the dog will outgrow it without any management
- Buying a third stop-coprophagia supplement after the first two failed
Asked, answered.
How common is poop-eating, really?
+
Common. A 2018 UC Davis study by Dr Benjamin Hart surveyed thousands of dog owners and found about 1 in 6 dogs are "serious" stool eaters, with roughly 1 in 4 caught at it at least once. It is one of the most reported "embarrassing" canine behaviours.
Will it make my dog sick?
+
Eating their own fresh stool rarely causes illness. Eating other animals' stool is riskier — parasites (giardia, roundworm, whipworm), bacteria (salmonella, campylobacter), and in rare cases viruses can transmit this way. Cat stool is the worst offender for parasite load.
Does poop-eating mean my dog has a deficiency?
+
It is the most popular theory online and the least supported in the literature. Dogs on complete commercial diets eat stool at the same rates as those on raw or fresh diets. Behaviour and instinct explain it better than nutrition.
Do those "stop coprophagia" supplements work?
+
Inconsistently at best. Forbid, Coproban, and similar products work for some dogs and do nothing for others. The Hart survey found over-the-counter products had under a 2% success rate when reported by owners. Removing access is more reliable than chemistry.
My puppy eats poop. Will they grow out of it?
+
Often, yes. Poop-eating peaks in puppies and young dogs and frequently fades by 18 to 24 months as they explore the world more confidently. Active management during the puppy phase — clean yard, leashed walks, calm redirection — usually does the heavy lifting.
When should I actually worry?
+
A sudden onset in an adult dog who never did this before, paired with weight loss, an increased appetite for food in general, or any GI signs (diarrhoea, vomiting, blood). That combination warrants bloodwork — malabsorption, EPI, or parasitism can show up this way.
Is it true some dogs eat poop because of stress?
+
Yes. Crated dogs, kennelled shelter dogs, and dogs left alone for long stretches show higher rates. The behaviour can also be reinforced if owners react dramatically — to a bored dog, any reaction is engagement.
If your dog has started this recently and you can't tell if it is medical or behavioural, Romp can help you log meals, stool quality, weight, and the times this happens — the kind of structured timeline a vet can read in thirty seconds.
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- Hart, B. L., Hart, L. A., Thigpen, A. P., et al. (2018). The paradox of canine conspecific coprophagy. Veterinary Medicine and Science, 4(2), 106–114.
- American Kennel Club. Why does my dog eat poop? akc.org.
- VCA Animal Hospitals. Coprophagia in dogs. vcahospitals.com.
- Cornell University College of Veterinary Medicine. Canine behaviour resources. vet.cornell.edu.
- PetMD. Why do dogs eat poop? petmd.com.
- Merck Veterinary Manual. Pica in dogs. merckvetmanual.com.