Dog diarrhea: when to worry and what to do
Diarrhea means loose, watery or more frequent poop, and in adult dogs it is often short-lived, set off by eating something unusual, a sudden food change or stress. An adult dog with one or two soft stools that is alert, eating and drinking normally can usually be watched at home, with fresh water always available. Blood or black stool, vomiting, weakness, not eating, a painful or swollen belly, a possible toxin or swallowed object, or diarrhea in a puppy needs a vet now.
General health information, not a diagnosis. If you are worried about your pet, contact a vet.
How urgent is it?
Go down the list and stop at the first row that matches your pet.
See a vet now
- Blood in the poop, or black, tarry stool
- Is also vomiting, especially more than once, or can’t keep water down
- May have eaten something toxic (such as chocolate, grapes, raisins, xylitol or human medicines) or an object such as a toy, sock or bone, even if your dog still seems fine
- Weak, very lethargic, wobbly, unable to stand or collapsed, has stopped eating, or seems very ill
- The belly seems painful or swollen, or there is a fever
- Seems dehydrated, or is passing large amounts of watery diarrhea again and again within a few hours
- Is a puppy or a dog that isn’t fully vaccinated, even if the diarrhea seems mild, or is a toy breed, a senior or a dog with an ongoing health condition and the diarrhea is frequent or watery
See a vet within 24 hours
- Has had several loose or watery stools today but is alert, eating and drinking
- Is eating noticeably less than usual, but still eating some
- Diarrhea has lasted more than 2 days, even if your dog seems fine
- Diarrhea keeps coming back over weeks, or comes with weight loss, or with mucus, straining and many small poops
Watch at home
- An adult dog has one or two soft stools after eating something unusual, a food change or a stressful event such as travel or boarding, and is otherwise alert, eating, drinking and playing normally
- Stools are firming up within a day or two of home care and there are no other signs: keep watching, and call your vet if it hasn’t settled after 2 days or keeps coming back
Not sure which row fits?
Describe your pet’s symptoms and get a free urgency check in about a minute.
Check my pet’s symptomsCommon causes
| Cause | What you may notice | Usual urgency |
|---|---|---|
| Eating something it shouldn’t | Diarrhea after getting into the trash, eating table scraps, fatty food or milk; often short-lived | Watch |
| Sudden change of food | Soft stool soon after switching to a new food or treats too quickly | Watch |
| Stress | Loose stool after travel, boarding, a vet visit or other changes at home | Watch |
| Intestinal parasites or other infections | Loose stool that may keep coming back, sometimes with mucus; your vet can check a stool sample | Within 24 h |
| Long-term conditions (for example food intolerance, inflammatory bowel disease, pancreas or liver problems) | Diarrhea that comes and goes over weeks, weight loss, changes in appetite | Within 24 h |
| Toxic food or substance | Diarrhea, often with vomiting, after eating chocolate, coffee, salty snacks, nuts or alcohol; can be followed by restlessness, tremors or seizures | Now |
| Swallowed object or bone | Vomiting, not eating, belly pain or swelling, sometimes with diarrhea; more common in young, large-breed dogs | Now |
| Parvovirus | Vomiting and bloody diarrhea, most often in puppies or dogs that aren’t fully vaccinated; can become life-threatening quickly | Now |
| Hemorrhagic gastroenteritis | Sudden vomiting and bloody diarrhea in a dog that was healthy before, more often in small and toy breeds | Now |
| Pancreatitis | Diarrhea with vomiting, belly pain, weakness and not eating, sometimes after getting into the trash or eating a lot of table scraps | Now |
What you can do at home
- Keep fresh water available at all times. Diarrhea makes dogs lose fluid quickly, so check that your dog is drinking. If your dog can’t keep water down, see a vet now.
- For an otherwise healthy adult dog, vets may suggest a short break from food (usually no more than 12 to 24 hours), or going straight to small portions of a plain, low-fat, easily digested meal such as boiled skinless chicken with plain white rice, a few times a day. Do not hold back food for longer than your vet advises. This kind of meal is not balanced for long-term feeding. For puppies, toy breeds, older dogs and dogs with a health condition, ask your vet before changing or holding back food.
- Once the poop is firm again, mix the usual food back in gradually over 7 to 10 days. If the diarrhea started after a food change, go back to the old food until stools firm up, then switch more slowly over one to two weeks.
- Take your dog outside more often, pick up poop promptly and keep sleeping and play areas clean.
- Write down when it happened, how often and what the poop looked like (watery, soft, mucus, blood or black), and take a photo. If you go to the vet, ask whether to bring a fresh stool sample.
What not to do
- Do not take water away, unless a vet tells you to.
- Do not give human anti-diarrhea medicines or stomach remedies unless a vet tells you to. Some can harm dogs, and diarrhea can be the body’s way of getting rid of something harmful.
- Do not give milk, fatty or rich food, bones or lots of treats until the diarrhea has settled.
- Do not wait to see if it passes if your dog may have eaten something toxic or swallowed an object. Call your vet or an emergency animal clinic right away.
What to tell the vet
- When the diarrhea started and how many times a day it happens, including at night
- What the poop looks like: watery, soft, with mucus, red blood or black and tarry (show the photo, or bring a fresh sample if asked)
- Anything your dog may have eaten: trash, toys, bones, people food, medicines or plants, and any recent change of food or treats
- Other signs: vomiting, appetite, energy, drinking, weight change
- Vaccination and deworming history, and any recent boarding or travel
Questions owners ask
My dog has diarrhea but is acting fine. Should I worry?
One or two soft stools in an adult dog that is alert, eating, drinking and playing normally are usually not a cause for concern, and most short bouts settle on their own. Keep water available and watch the next stools. Call a vet if it lasts more than 2 days or keeps coming back, and go now if there is blood or black stool, vomiting, weakness or a painful belly, if your dog has stopped eating, or if your dog is a puppy.
What can I give my dog for diarrhea at home?
Water matters most, so keep fresh water out at all times. For an otherwise healthy adult dog, small portions of a plain, low-fat, easily digested meal, such as boiled skinless chicken with white rice, are commonly suggested until stools firm up. Do not give human anti-diarrhea medicines or stomach remedies unless a vet tells you to, because some can harm dogs. Ask your vet before giving any supplement, as the quality and effect of these products are not always known.
My dog has had diarrhea for 3 days. What should I do?
Call your vet. Veterinary sources advise a vet visit when loose stools last more than 2 days, even if the dog seems fine, and also when a plain diet has not helped after 2 to 3 days. Take a photo of the poop or bring a fresh sample if asked. Go now, without waiting for an appointment, if you notice blood, vomiting, weakness or your dog has stopped eating.
Should I stop feeding my dog with diarrhea?
Not without asking your vet. For an otherwise healthy adult dog, some vets suggest a short break from food, usually no more than 12 to 24 hours, while others go straight to small, easily digested meals. A 2020 veterinary review calls 24 to 48 hours without food the traditional approach, and notes that early feeding led to faster improvement in studies, mainly in dogs treated in hospital for parvovirus. Never take water away. For puppies, toy breeds, older dogs and dogs with a health condition, ask your vet before holding back any meal.
Why does my dog keep getting diarrhea, sometimes at night?
Diarrhea that keeps coming back can be linked to parasites, a food intolerance, inflammatory bowel disease or other long-term conditions. When the large intestine is affected, dogs often pass small, frequent stools with mucus, strain, and may need to go out urgently, including at night. Repeated diarrhea, especially with weight loss, needs a vet visit to find the cause, while a single night of loose stool in a dog that is otherwise well can usually be watched.
Related symptoms
Sources
- Diarrhea in Dogs, VCA Animal Hospitals
- Urgent Care for Diarrhea or Vomiting, VCA Animal Hospitals Urgent Care
- Diarrhea, Cornell Richard P. Riney Canine Health Center
- When to Go to the ER, Cornell Richard P. Riney Canine Health Center
- Disorders of the Stomach and Intestines in Dogs (Pet Owner Version), Merck Veterinary Manual
- Introduction to Digestive Disorders of Dogs (Pet Owner Version), Merck Veterinary Manual
- Pancreatitis and Other Disorders of the Pancreas in Dogs (Pet Owner Version), Merck Veterinary Manual
- Acute Diarrhea in Dogs: Current Management and Potential Role of Dietary Polyphenols Supplementation, Antioxidants, 2020
- People Foods to Avoid Feeding Your Pets, ASPCA Animal Poison Control
- Dog Diarrhea: Signs, Symptoms, and Treatments, American Kennel Club
Last reviewed October 25, 2026