If your dog has diarrhoea but is acting fine, eating and playing normally, it is usually a short-lived upset from scavenging, a food change or stress. Give plenty of water and small bland meals, and watch closely. Call your vet if it lasts beyond a day or two, or if you see blood, vomiting or tiredness.
It can be confusing when your dog is bouncing around, keen for walks and eating well, yet producing loose stools that have you reaching for the kitchen roll. The gut is sensitive to change, and even small upsets can cause loose stools. The reassuring part is that most mild cases settle with simple care.
Why does my dog have diarrhoea but still seem fine?
Usually because the upset is mild and limited to the gut. The most common cause is scavenging: something questionable picked up on a walk or stolen from the bin. Unlike people, who often feel rotten when their digestion is upset, dogs frequently stay cheerful while their gut deals with it.
Sudden food changes are another common trigger. A new brand of kibble, new treats or generous table scraps can all do it. The bacteria in the gut need time to adjust to new ingredients. Our dog gut microbiome guide explains why.
Stress and excitement can also cause loose stools without affecting energy. House moves, a new baby, visitors or even a fun but busy weekend can all set it off.
When should I call the vet if my dog seems well?
Call your vet if diarrhoea lasts more than 24 to 48 hours, even if your dog seems fine. Acute diarrhoea is very common: a VetCompass study of UK dogs found about one in 12 dogs is diagnosed with it each year, and over 80% of cases needed only one vet visit.
Dehydration can develop quickly, especially in small dogs and puppies. Watch for subtle changes too. Is your dog a little less keen on their favourite games, or slower to come when called?
Blood in the stool always needs prompt vet attention, even in a dog who seems perfectly well. So do repeated vomiting, a swollen belly, refusing food or marked tiredness. Diarrhoea that becomes explosive, full of mucus or very foul-smelling also needs a vet check.
Some breeds deserve extra care. The same UK study found higher odds of acute diarrhoea in Maltese, Miniature Poodles, Cavapoos, German Shepherds, Yorkshire Terriers and Cockapoos. Dogs under three and over nine were also more likely to be diagnosed.
What should I feed my dog with diarrhoea who is acting normal?
Small, frequent meals of bland, easy food. Plain boiled chicken breast with no skin or seasoning, mixed with white rice, works well. Some dogs do better on plain white fish such as cod. Our guide to white fish for sensitive stomachs covers that option.
Feed little and often: perhaps a quarter portion every few hours rather than normal meals. Then mix your dog's usual food back in gradually over a few days.
Keep fresh water available at all times, because diarrhoea increases fluid loss. Check the gums: they should feel slippery and wet, not tacky.
Current vet thinking is to keep feeding rather than starving a dog with simple diarrhoea, because the gut lining needs nutrients to repair. A long fast is no longer the standard advice. The PDSA advice on diarrhoea in dogs also explains when to get help.
The best home remedy is simple: water, small bland meals and time. Avoid human medicines. Products such as Imodium or Pepto-Bismol can be harmful to dogs or hide a more serious problem. Skip oils and rich foods too, which can make things worse.
What does my dog's diarrhoea look like, and what does it mean?
The look of the stool gives useful clues. Watery, yellow stools often mean food is moving quickly through the small intestine, perhaps after scavenging or stress.
Stools coated in mucus suggest irritation of the large intestine, which can point to colitis in dogs. A noisy, gurgling tummy often goes along with this kind of upset.
Greasy, pale stools can mean fat is not being absorbed well. Very dark, tarry stools may mean bleeding higher up the gut. Any blood, bright red or dark, needs prompt vet attention whatever your dog's mood.
How can I prevent future bouts of mild diarrhoea?
Feed consistent, good-quality food and avoid frequent changes. When you do switch foods, do it gradually over 7 to 10 days so the gut can adjust. Fibre helps too: soluble fibre feeds helpful gut bacteria, while insoluble fibre keeps stools regular.
Antibiotics are rarely needed for simple, acute diarrhoea. The VetCompass research raised concern that antibiotics are still often used for it, despite years of advice that most cases do not need them. Supportive care, diet and a dog-specific probiotic are the usual first steps.
As an MRCVS-registered vet, I see gut health as the base for a lot of other things. The gut helps shape immune responses, and a settled gut is easier to keep settled. For dogs with a delicate gut, our guide to sensitive stomachs in dogs has more on long-term care.
Daily support can help too. Juno Daily combines 2 billion CFUs of Calsporin® Bacillus velezensis, a spore-forming probiotic, with 15 billion cells of inactivated helpful bacteria and prebiotics such as chicory root and MOS. Our page on Juno Daily for gut health lists every amount. If you are not sure what your dog needs, the Juno supplement quiz is a sensible first step before you buy anything.
What diarrhoea remedies should I avoid?
Avoid human anti-diarrhoea medicines, including Imodium (loperamide), Pepto-Bismol and Kaopectate, unless your vet prescribes them. They can be harmful to dogs or hide a problem that needs treatment.
Avoid folk remedies such as activated charcoal, baking soda or essential oils. They may sound natural, but they can do more harm than good.
Do not assume diarrhoea is unimportant because your dog seems fine. Conditions such as inflammatory bowel disease can start as mild, on-and-off loose stools in a dog who looks healthy.
Do not keep a dog on chicken and rice for weeks without vet advice. It is fine for a few days, but it is not complete nutrition. And watch for other signs, such as bad-smelling dog farts, appetite changes or quiet behaviour, which may point to a bigger gut problem.
Most dogs with diarrhoea who are acting fine bounce back within a day or two with water, bland food and patience. Keep an eye out for red flags, and call your vet if you are worried. For daily gut support once things settle, Juno Daily is an easy place to start.
Frequently asked questions
How long is it safe for a dog to have mild diarrhoea if acting normal?
Watch for 24 to 48 hours. If it carries on beyond that, gets worse, or your dog becomes quiet or stops eating, contact your vet, as dehydration and other problems can develop.
My puppy has diarrhoea but is acting fine. What should I do?
Call your vet sooner than you would for an adult dog. Puppies dehydrate quickly and are more prone to infections and parasites. If your puppy is young, not fully vaccinated or has blood in the stool, phone the same day.
What bland diet is best for a dog with an upset stomach?
Plain boiled chicken breast, with no skin or bones, mixed with plain white rice. Feed small, frequent portions. Plain white fish is a good alternative.
Can stress cause diarrhoea in dogs?
Yes. Stress and anxiety can upset the gut and cause diarrhoea, much as they can in people. Reducing the stress usually helps it settle.
Should I withhold food from my dog if they have diarrhoea but are otherwise fine?
Not for long. A short break of a few hours may be suggested for sudden diarrhoea, but long fasting is not recommended. Gut cells need nutrients to repair, so small, frequent bland meals are usually better.
Should I give my dog a probiotic for mild diarrhoea?
A dog-specific probiotic is a sensible addition, alongside small bland meals. Avoid human probiotics, which may contain xylitol, a sweetener that is toxic to dogs.
When is diarrhoea an emergency in a dog?
Go to a vet promptly for blood in the stool, repeated vomiting, a swollen or painful belly, weakness, collapse or refusing food. Puppies and older dogs need help sooner.
This guide is for informational purposes only and does not constitute veterinary advice. Always consult your vet before making changes to your dog's diet, supplement routine, or healthcare plan.
