Call your vet today
Call your vet or poison control now. Acetaminophen (Tylenol, paracetamol) can damage a dog's liver and red blood cells. Signs are not expected below about 100 mg/kg, but small dogs can reach that with one or two extra-strength tablets.
What to do right now
- Note the strength (325 mg, 500 mg or 650 mg) and count missing tablets.
- Calculate the dose: mg eaten ÷ dog's weight in kg.
- Call your vet or poison control right away.
- Bring the package to the vet.
Why tylenol can be dangerous for dogs
Dogs break down acetaminophen into a compound that injures liver cells and turns hemoglobin into methemoglobin, which cannot carry oxygen. Merck reports signs in dogs above about 100 mg/kg and methemoglobinemia above 200 mg/kg.
Symptoms to watch for
- Vomiting and loss of appetite
- Brown or blue-gray gums
- Fast or difficult breathing
- Swelling of the face and paws
- Yellow gums or eyes (liver damage, 24-72 hours)
What not to do
- Never give Tylenol to a dog without vet advice.
What the vet will do
Treatment includes decontamination, the antidote N-acetylcysteine, liver protectants and blood tests.
Related guides
Dog ate tylenol: FAQ
Is Tylenol safer than ibuprofen for dogs?
Vets occasionally prescribe acetaminophen for dogs at specific doses, but it should never be given without veterinary guidance. It is extremely toxic to cats.
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Sources
This guide is general information, not a diagnosis. Every pet is different: when in doubt, call your vet or an animal poison control line.