Most stomach upsets pass in a day or two. A few signs mean it isn't a simple upset. Here is how to tell the difference, what to do in the meantime, and what to tell your vet.
- A single episode in an otherwise bright, hungry adult pet can often be watched for a day.
- Blood, repeated vomiting, lethargy, belly pain, or a suspected swallowed object or toxin mean a vet visit now, not later.
- Puppies, kittens, seniors and pets with existing illness get sick faster. Call sooner.
Three levels of concern
| Level | What you see | What to do |
|---|---|---|
| Watch at home | One or two episodes, pet still bright, drinking, interested in food, no other symptoms | Keep water available, watch closely, note times. Call your vet if it continues beyond a day or two. |
| Call the vet today | Vomiting or diarrhea lasting more than a day or two, reduced appetite, tiredness, repeated episodes, a puppy, kitten or senior, or a chronic condition | Phone your vet and describe the pattern. Do not wait for it to "run its course." |
| Emergency now | Blood in vomit or stool, black tarry stool, a swollen or painful belly, unproductive retching, collapse, pale gums, trouble breathing, or a suspected toxin or swallowed object | Go to an emergency vet right away and call ahead. |
Red flags that change everything
- Blood. Red streaks, "coffee-ground" vomit or black, tarry stool all need a vet.
- Swallowed something. A sock, toy, corn cob, bones or anything toxic. A blocked gut can look like ordinary vomiting at first.
- Unproductive retching with a tight belly, especially in deep-chested dogs, can be bloat, a true emergency.
- Fever, lethargy or belly pain. These point to something beyond a mild upset.
- Dehydration. Dry, tacky gums, sunken eyes, or skin that is slow to settle back after a gentle pinch.
- A cat that stops eating. Cats can become seriously ill when they skip meals for long. Don't wait it out with a cat.
What you can do while you wait
- Keep fresh water available. Small, frequent sips are easier to keep down than a big drink.
- Ask your vet before withholding food. Some vets suggest a short rest from food for adult dogs, but this is not appropriate for puppies, kittens, small dogs or cats. Follow your vet's instruction rather than a rule of thumb.
- If your vet advises it, reintroduce a bland, easily digested diet in small, frequent portions and return to normal food gradually over several days.
- Do not give human anti-nausea or anti-diarrhea medicines. Some are harmful to cats and dogs. Medicines like these should only be given on your vet's direction.
Why diarrhea that keeps coming back matters
A short bout can follow a sudden diet change or a stressful event. Diarrhea that lasts or keeps returning, especially in an adult cat, can point to underlying problems such as thyroid, kidney or liver disease, so it deserves a proper check rather than another diet trial.
Information that helps your vet most
- When it started, how often it has happened, and whether it is true vomiting (belly heaving, drooling) or effortless regurgitation after eating.
- What it looked like: colour, blood, foam, food, worms.
- Anything new or stolen: scraps, bin raiding, plants, medication, a toy that is missing.
- Appetite, water intake, energy and anything else that has changed.
- Vaccination and parasite-treatment dates, and any ongoing medication.
Furvey's health notes and AI symptom checker let you log exactly when and how often something happened, and get a plain-language read on urgency — so the call to your vet starts with useful detail instead of a guess.
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Not veterinary advice. This article is for general information only and is not a substitute for professional veterinary diagnosis or treatment. If your pet is unwell, contact your veterinarian.