Section: Parasitic Diseases

Dog Diarrhea: When Should You Call the Vet?

Call your vet if diarrhea is bloody, severe, repeated, or paired with vomiting, pain, fever, or weakness. Puppies and senior dogs can dehydrate quickly. Mild loose stool still needs monitoring if it lasts more than a day.

What symptoms or causes should I watch for?

  • Dietary upset: New food, table scraps, or garbage are common triggers.
  • Parasites: Roundworms, hookworms, giardia, and other parasites can cause diarrhea.
  • Infection: Viruses and bacteria can be serious, especially in puppies.
  • Stress: Boarding, travel, or a new home can change stool quality.
  • Chronic disease: Food allergy, bowel disease, liver disease, or pancreas problems may be involved.

What can I safely do at home right now?

  • Keep water available: Hydration matters, but do not force drinking.
  • Save a stool sample: Your vet may need it for testing.
  • Skip table food: Avoid rich, fatty, or unfamiliar foods.
  • Clean carefully: Use good hygiene after accidents.
  • Call before medicines: Human anti-diarrhea drugs can be unsafe for some pets.

When is this an emergency?

Go to an emergency veterinary clinic now if you notice:

  • Blood, black stool, or large amounts of watery stool.
  • Vomiting plus diarrhea.
  • Weakness, collapse, pale gums, or dehydration.
  • Diarrhea in a young puppy or unvaccinated dog.
  • Pain, fever, or a swollen belly.

What will my veterinarian check?

A veterinarian may check hydration, parasites, diet history, vaccines, and infection risk. Treatment depends on the cause.

How can I reduce the risk next time?

Make diet changes slowly. Keep vaccines current. Use parasite prevention and keep trash inaccessible.

Related veterinary guides

References

Disclaimer: This article is for educational and informational purposes only. It does not constitute medical advice, does not establish a vet-client-patient relationship, and should not replace an in-person evaluation by a licensed veterinarian.