My dog ate acetaminophen (tylenol, paracetamol) — what should I do?
Depends on the dose — check the calculator
What to do now
- Risk depends on how much acetaminophen your dog ate per kg of body weight (0 mg/kg → YELLOW, 50 mg/kg → RED). Use the PawPanic calculator with your dog's weight and the amount.
- If you can't estimate the amount, assume the worst and call your vet or a poison hotline.
- Remove any remaining material and keep packaging/labels — the vet will want product names and amounts.
- Do not induce vomiting unless a vet or poison-control expert tells you to.
- Note the time it was eaten, roughly how much, and your dog's weight.
Why it's a problem
Liver damage and red-blood-cell injury (methemoglobinemia).
Symptoms to watch for
Brown gums, fast breathing, facial/paw swelling, vomiting, jaundice.
When: 1-4 hours
⚠️ Combination cold/flu products may also contain decongestants - see Decongestants.
Frequently asked questions
Is acetaminophen (tylenol, paracetamol) dangerous for dogs?
It depends on the amount and your dog's weight. Liver damage and red-blood-cell injury (methemoglobinemia). Use the PawPanic calculator or call your vet.
What are the symptoms if my dog ate acetaminophen (tylenol, paracetamol)?
Brown gums, fast breathing, facial/paw swelling, vomiting, jaundice.
How soon do symptoms appear after a dog eats acetaminophen (tylenol, paracetamol)?
1-4 hours
Is there anything else to know about acetaminophen (tylenol, paracetamol)?
Combination cold/flu products may also contain decongestants - see Decongestants.
What should I do if my dog ate acetaminophen (tylenol, paracetamol)?
If you can't estimate the amount, assume the worst and call your vet or a poison hotline.
Who can I call for help?
ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661, both 24/7 (fees may apply), or your nearest emergency vet.
Dose guidance
Merck: signs in dogs above 100 mg/kg, methemoglobinemia >200 mg/kg. PawPanic flags RED at 50 mg/kg (conservative).
Sources
Last verified against these sources: 2026-10-13. Where sources disagree, PawPanic uses the more conservative guidance.
Also known as: tylenol, paracetamol, panadol · Category: Medication · Last reviewed 2026-10-14