PupkeeperToxicEmergency
Dog ate naproxen? What to do
Naproxen is very poisonous to dogs. It can cause severe stomach ulcers, bleeding in the gut and sudden kidney failure.
If your dog ate or touched this, call your vet or a pet poison line now
United States
Poison lines in other countries: United Kingdom, Australia, Canada, New Zealand
What to do now
- Call your vet or a pet poison line now.
- Keep the packaging and bring it with you.
- Don't wait for signs. Ask for treatment advice right away.
Don't
- Don't make your dog vomit unless a vet tells you to.
- Never give naproxen to your dog.
Signs to watch for
- Vomiting, sometimes with blood
- Black, tarry stool
- Diarrhea
- Not eating
- Belly pain
- Weakness
- Pale gums
- Low energy
Why
Naproxen is a human anti-inflammatory pain reliever with a narrow margin of safety in dogs. It also stays in a dog's body for a long time.
Sources
- Pet Poison Helpline: Naproxen
- Merck Veterinary Manual: Poisoning from Human Over-the-Counter Drugs
- Merck Veterinary Manual: Toxicoses From Human Analgesics in Animals
Guide reviewed 9 October 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.