Why?

Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX) enzymes. In humans, this reduces inflammation and pain. In dogs, the same mechanism causes serious gastrointestinal and renal damage at doses far below those used in humans.

Ibuprofen reduces the prostaglandins that protect the stomach lining, causing erosion, ulceration, and perforation. It also constricts the blood vessels supplying the kidneys, causing acute renal failure. Dogs have a longer half-life for ibuprofen than humans, allowing it to accumulate to toxic levels.

One 200mg tablet (a standard over-the-counter dose) can cause serious GI and kidney damage in a dog under 10 lbs. A 400mg tablet can be fatal for a small dog. Ibuprofen is found in pill form on nightstands, in purses, and in bathroom cabinets — dogs who chew through a pill bottle can consume dozens of tablets in minutes.

How much is dangerous?

GI ulceration begins at approximately 25mg per kg. Kidney failure at 125mg/kg. Neurological signs at 175mg/kg. One 200mg tablet can be toxic for a dog under 8kg (17 lbs).

What are the symptoms?

ONSET:GI signs within 2–6 hours. Kidney failure signs within 12–24 hours.
  • vomiting (often with blood)
  • loss of appetite
  • lethargy
  • abdominal pain
  • dark or tarry stools (GI bleeding)
  • increased thirst and urination then none (kidney failure)
  • seizures at high doses
  • coma

What should I do?

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Emergency veterinary care immediately — do not wait for symptoms. Bring the pill bottle so the vet can calculate the exact dose. Treatment includes induced vomiting (if recent), activated charcoal, IV fluids to protect kidneys, GI protectants, and hospitalization.

Frequently asked questions.

Can I give my dog ibuprofen for pain?

Never. Ibuprofen is not safe for dogs at any dose. There are veterinary-specific pain medications — contact your vet for safe alternatives.

My dog ate one ibuprofen pill — is that an emergency?

Yes. Even one tablet is potentially dangerous depending on dog size. Call your vet or ASPCA Poison Control immediately.

Are there dog-safe NSAIDs?

Yes — veterinary NSAIDs like carprofen, meloxicam, and deracoxib are formulated for dogs at safe doses. Never use human NSAIDs.

Disclaimer: This information is for educational purposes only and does not constitute veterinary advice. Every dog is different. Always consult your veterinarian before making changes to your dog's diet or in the event of a potential poisoning emergency.