Acute Diarrhea in Dogs: When to Worry and What to Feed
Diarrhea is common in dogs but can indicate something serious. Learn when it's an emergency and how to manage it at home.
Acute diarrhea — sudden onset of loose, watery stools — is one of the most common reasons dogs visit the vet. Most cases are caused by dietary indiscretion (eating something they shouldn't) and resolve within 1-2 days. However, some cases need immediate veterinary attention.
Key Points
- Most acute diarrhea is caused by dietary indiscretion
- Bland diet (boiled chicken + rice) helps settle the stomach
- Keep your dog hydrated — diarrhea causes fluid loss
- Bloody diarrhea is always a vet emergency
- Puppies with diarrhea need vet attention quickly
- If diarrhea lasts more than 48 hours, see your vet
Common Causes
The most common cause is eating something unusual — garbage, table scraps, a new food, or something from outside. Other causes include bacterial infections (Salmonella, E. coli), viral infections (parvovirus in unvaccinated puppies), parasites (Giardia, roundworms), food allergies, stress, and medication side effects.
Home Management
For mild diarrhea in an otherwise alert, eating dog: fast for 12 hours (water only), then introduce a bland diet of boiled chicken breast (no skin, no seasoning) and white rice in a 1:2 ratio. Feed small, frequent meals. Gradually transition back to regular food over 3-4 days. Ensure fresh water is always available.
When It's an Emergency
Rush to the vet if you see: blood in the stool (bright red or black/tarry), diarrhea with vomiting, lethargy or collapse, a puppy with diarrhea (they dehydrate quickly), diarrhea lasting more than 48 hours, suspected toxin ingestion, or if your dog is also not drinking water.
Prevention
Keep garbage secured, don't change food suddenly (transition over 7-10 days), avoid giving table scraps, keep your dog's vaccinations and deworming up to date, and supervise outdoor time to prevent scavenging.
When to See a Vet Immediately
- Blood in the stool (red or black)
- Diarrhea with vomiting
- Lethargy, weakness, or collapse
- A puppy with diarrhea
- Diarrhea lasting more than 48 hours
- Your dog won't eat or drink
How RVC Can Help
RVC can quickly diagnose the cause of diarrhea through fecal testing, blood work, and imaging if needed. We provide IV fluids for dehydration, anti-nausea medication, and targeted treatment. Walk-ins welcome for urgent cases — call +853 6677 6611.
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.