# Coprophagia in Senior Dogs: Why Older Dogs Eat Poop New stool-eating in an older dog is often different from a lifelong habit. In seniors, coprophagia in senior dogs can point to cognitive dysfunction, a diet change, or poor nutrient absorption. A dog who has eaten poop for years is usually showing a behavior pattern, while a dog who starts at age 10 or 12 needs a closer look. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - New-onset poop eating in a senior dog deserves a veterinary visit, because it can be the first sign of a medical problem. - Cognitive decline is a common driver in older dogs. Memory, learning, awareness, and senses can all fade with age [1]. - Diet changes and poor digestion can play a role. Gut bacteria shift with age and differ between poop-eating and non-poop-eating dogs [2]. - Poop eating can be physically risky. A dog can absorb medication from another pet's feces, which has caused liver and kidney problems in at least one reported case [3]. - Management combines a vet exam, a consistent high-fiber or balanced diet, cleaning the yard promptly, and reward-based training. ## Why Older Dogs Eat Poop Coprophagia is the medical term for eating feces. It is common in dogs, and it is not automatically a sign of illness [4]. Many dogs sample poop at some point, especially puppies. The question for an older dog is whether this is old behavior or something new. ### Normal and behavioral reasons Some dogs eat poop because it tastes like food. Dog feces can carry real calories, and wild animals exploit that. In one study, dog feces had enough energy value that red foxes regularly ate it [5]. Your dog may be following the same instinct. Other behavioral reasons include: - Appetite and hunger. A dog on a lower-calorie diet, or one who feels hungry between meals, may scavenge more. - Boredom or under-stimulation. A dog left alone with little to do may develop repetitive habits. - Stress or anxiety. Changes in routine, a new pet, or a move can trigger new behaviors. - Attention. If eating poop gets a big reaction, some dogs repeat it. - Puppyhood habit that never faded. Some dogs carry the behavior into adulthood. These reasons are still worth addressing, but they are less urgent than a sudden change in a senior. ### Why age changes the picture Aging affects the brain. Memory, the ability to learn, awareness, and the senses of sight and hearing can all decline [1]. Social relationships with you and other pets can change too [1]. A dog who suddenly eats poop may be confused, may not recognize the behavior as wrong, or may be responding to a body signal that something feels off. The gut also changes with age. A large study of the canine gut microbiome found gradual, age-associated shifts in bacterial populations [2]. The same study found that coprophagy was one of the behaviors linked to microbiome composition [2]. This does not prove that poop eating causes gut changes or the reverse. It does show that diet, aging, and this behavior are connected. ## Medical Causes to Rule Out New coprophagia in a senior is a reason to schedule an exam. Your veterinarian will likely start with a full history, a physical exam, and lab work. Here are the main categories they will consider. ### Cognitive dysfunction Canine cognitive dysfunction is the dog version of dementia. Signs include confusion, staring at walls, getting stuck in corners, pacing at night, and house soiling. A study of aging dogs found that soiling behavior was associated with cognitive test performance and with urinalysis abnormalities [6]. That means a dog who starts having accidents or eating waste may be showing early brain changes, not just a bathroom problem. If your dog also seems disoriented, sleeps more during the day, or seems to forget familiar routines, mention this to your vet. Cognitive dysfunction is manageable, and earlier support tends to work better. ### Malabsorption and digestive disease If your dog's body is not absorbing nutrients well, the dog may feel hungry even after eating. Poop eating can follow. Conditions that cause malabsorption include chronic intestinal disease, pancreatitis, and parasites. Your vet may recommend a fecal test, blood work, and sometimes a diet trial. ### Diet change or an unbalanced diet A recent food switch can trigger new poop eating. So can a homemade diet that is not balanced. The gut microbiome study found that commercial versus home-cooked nutrition was associated with microbiome composition [2]. If you changed your dog's food in the last few months, tell your vet the brand, the amount, and the date of the switch. ### Medication exposure through feces This is one of the most serious risks. A dog can absorb a drug by eating the feces of another pet who takes that drug. In one reported case, a dog developed urinary problems and liver enzyme changes after eating the feces of a housemate who was receiving carprofen [3]. The signs resolved once the dog could no longer access that feces [3]. If anyone in your home takes medication, including other pets, keep all feces out of reach. ### Other health problems Pain, dental disease, vision loss, and arthritis can all change behavior. A dog who cannot see well may find food and waste by smell alone. A dog in pain may act differently. A full exam helps sort this out. ## When Coprophagia Becomes a Problem Poop eating is a problem when it affects health, safety, or your household. - Health risk. Parasites, bacteria, and medication residue can pass through feces [3]. - Nutrition. In healthy adult dogs, coprophagy did not change most digestibility measures in one study [4]. That is reassuring, but it does not cover sick, senior, or malnourished dogs. - Weight and appetite. A dog filling up on waste may eat less at meals. - Household stress. Constant vigilance and cleanup wear owners down. - Underlying disease. The behavior may be the first visible sign of a condition that needs treatment. If your dog is otherwise well and has done this for years, the risk is lower. If the behavior is new, frequent, or paired with weight loss, vomiting, diarrhea, or confusion, treat it as a medical concern. ## What to Do: Step by Step ### Step 1: Book a veterinary exam Start here. Your vet can rule out pain, dental disease, parasites, and organ problems. Bring a fresh stool sample if you can. Describe when the behavior started, what your dog eats, and any medications in the home. ### Step 2: Review the diet with your vet Ask whether your dog's current food is complete and appropriate for a senior. Some dogs do better on a higher-fiber diet, but the right choice depends on your dog's health. Your veterinarian sets the specific diet and any supplement doses based on your dog's weight and lab results. ### Step 3: Manage the environment - Pick up feces immediately in the yard, on walks, and in the litter box. - Supervise outdoor time. Use a leash even in a fenced yard during this phase. - Keep other pets' waste and any medication out of reach [3]. - Feed meals on a schedule so your dog is not hungry between meals. ### Step 4: Add enrichment Boredom feeds repetitive behavior. Try food puzzles, snuffle mats, short training sessions, and sniff walks. Rotate toys so they stay interesting. Mental work tires a dog in a good way. ### Step 5: Train a solid "leave it" Reward-based training works best. Practice "leave it" with low-value items first, then build up. Reward your dog for coming away from waste. Keep sessions short and calm. If your dog has cognitive decline, training may take longer and needs patience [1]. ### Step 6: Track progress Keep a simple log. Note the date, time, and what your dog ate. Note any accidents, confusion, or appetite changes. This record helps your vet spot patterns and adjust the plan. For a broader look at the behavior itself, see [Why Does My Dog Eat Poop?](/knowledge/veterinary-medicine/parasitic-diseases/why-does-my-dog-eat-poop) and [Why Is My Dog eating stools? Coprophagia Causes and Deterrents](/knowledge/veterinary-medicine/symptom-guides/why-is-my-dog-eating-stools-coprophagia-causes-and-deterrents). ## What Not to Do ### Do not punish your dog Punishment does not teach a dog what to do instead. It can raise anxiety, which may make the behavior worse. It can also make your dog hide the behavior, so you cannot monitor it. Skip scolding, yelling, and physical corrections. ### Do not rely on myths - "It means my dog is missing nutrients." Sometimes true, often not. Only testing can tell. - "Pineapple or pumpkin will fix it." These are common home remedies, but there is no strong evidence they stop coprophagia. Ask your vet before adding anything to the diet. - "It is just a bad habit." In a senior with new behavior, that assumption can delay diagnosis. - "My dog will outgrow it." Puppies often do. Seniors usually do not without help. ### Do not use harsh deterrents without guidance Some products aim to make feces taste bad. Results vary, and the underlying cause still needs attention. Talk to your vet before trying any over-the-counter product. ### Do not ignore medication risks If another pet in your home takes medication, assume the feces is not safe [3]. Clean it up right away. ## When to Involve a Veterinarian or Behavior Professional Call your veterinarian if the behavior is new, if it started after a diet change, or if your dog is a senior. A certified behavior professional can help if medical causes are ruled out and the behavior continues. Look for someone with training in reward-based methods. If your dog eats poop and then vomits, read [Dog Eating Poop and Vomiting: Is It Dangerous?](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-eating-poop-vomiting). If your dog is not producing stool but still eating, see [Dog Not Pooping but Eating Normally: Causes and Solutions](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-not-pooping-eating-normally). ## Limitations and When to Contact a Veterinarian This article cannot tell you what is causing your dog's behavior. Only a veterinarian who examines your dog can do that. Individual cases need a veterinarian. Contact your veterinarian the same day if your dog: - Eats feces from a pet who takes medication [3] - Vomits repeatedly or has diarrhea - Refuses food or seems painful - Shows sudden confusion, pacing, or staring - Has a swollen or tender belly Go to an emergency clinic now if your dog: - Collapses, has a seizure, or has trouble breathing - Has a bloated, hard abdomen - Cannot stand or walk - Shows severe weakness or pale gums Schedule a routine visit soon if your senior dog: - Starts eating poop after years of not doing it - Has accidents in the house or seems disoriented [6] - Loses weight or has a dull coat - Has a recent diet change - Has not had a senior wellness exam in the past year ## Frequently Asked Questions ### Is it normal for an older dog to start eating poop? It is common but not normal in the sense of being harmless. A new habit in a senior often points to a health or brain change. Your vet should check for cognitive dysfunction, digestive disease, and diet problems. ### Can cognitive dysfunction cause a dog to eat poop? Yes, it can contribute. Aging dogs can lose memory, awareness, and learning ability [1]. A confused dog may not recognize waste as something to avoid. Soiling and cognitive decline are linked in aging dogs [6]. ### Does eating poop mean my dog is missing nutrients? Sometimes, but not always. Poor absorption can make a dog feel hungry, which can lead to poop eating. In healthy adult dogs, one study found little effect on most nutrient digestibility measures [4]. Testing is the only way to know for your dog. ### Can my dog get sick from eating another pet's poop? Yes. A dog can absorb medication from another pet's feces, which has caused liver and urinary problems in a reported case [3]. Feces can also carry parasites and bacteria. Keep all waste picked up, especially if any pet takes medication. ### Will my dog stop eating poop on its own? Some dogs stop when the trigger is removed, such as a diet change or a treated illness. Others need ongoing management. If the behavior continues after medical causes are ruled out, ask your vet about a behavior plan. ## Related Articles - [Why Does My Dog Eat Poop?](/knowledge/veterinary-medicine/parasitic-diseases/why-does-my-dog-eat-poop) - [Why Is My Dog eating stools? Coprophagia Causes and Deterrents](/knowledge/veterinary-medicine/symptom-guides/why-is-my-dog-eating-stools-coprophagia-causes-and-deterrents) - [Dog Eating Poop and Vomiting: Is It Dangerous?](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-eating-poop-vomiting) - [Why Does My Dog Eat Grass?](/knowledge/veterinary-medicine/symptom-guides/why-does-my-dog-eat-grass) - [Dog Not Pooping but Eating Normally: Causes and Solutions](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-not-pooping-eating-normally) - [Why Is My Dog eating grass and vomiting? GI Distress vs Normal Behavior](/knowledge/veterinary-medicine/symptom-guides/why-is-my-dog-eating-grass-and-vomiting-gi-distress-vs-normal-behavior) - [Why Is My Senior Dog Eating Dirt, Poop, or Grass?](/knowledge/veterinary-medicine/digestive-and-urinary-care/senior-dog-eating-dirt-poop-grass) - [Senior Dog Not Eating: Causes, Weight Loss and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/senior-dog-not-eating) - [Senior Dog Diarrhea and Vomiting: Causes and When to Worry](/knowledge/veterinary-medicine/digestive-and-urinary-care/senior-dog-diarrhea-vomiting-causes) ## References 1. [Behavior Problems in Older Dogs](https://www.aspca.org/pet-care/dog-care/common-dog-behavior-issues/behavior-problems-older-dogs). ASPCA Animal Poison Control Center. 2. [Mapping the canine gut microbiome: insights from the Dog Aging Project](https://pubmed.ncbi.nlm.nih.gov/42156772/). Nature communications, 2026. 3. [Suspected carprofen toxicosis caused by coprophagia in a dog](https://pubmed.ncbi.nlm.nih.gov/23971852/). Journal of the American Veterinary Medical Association, 2013. 4. [Evaluation of the Influence of Coprophagic Behavior on the Digestibility of Dietary Nutrients and Fecal Fermentation Products in Adult Dogs](https://pubmed.ncbi.nlm.nih.gov/36548846/). Veterinary sciences, 2022. 5. [Interspecific coprophagia by wild red foxes: DNA metabarcoding reveals a potentially widespread form of commensalism among animals](https://pubmed.ncbi.nlm.nih.gov/35795356/). Ecology and evolution, 2022. 6. [The relationship between urinalysis abnormalities, soiling behavior, and cognitive decline in aging dogs](https://pubmed.ncbi.nlm.nih.gov/42806282/). Journal of veterinary internal medicine, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)