✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-06
Can dogs eat paracetamol?
The full picture
Paracetamol is one of the most common causes of fatal poisoning in dogs in the UK — and almost all cases happen when an owner gives it deliberately, intending to help with pain. The toxic dose for dogs is far lower than for humans: as little as 75mg/kg can cause severe liver damage, and a single 500mg tablet can be fatal to a small dog.
Dogs lack sufficient quantities of the enzyme needed to safely process paracetamol's toxic metabolite (NAPQI), which destroys liver cells and binds to red blood cells, causing methaemoglobinaemia.
Common UK brands containing paracetamol: Panadol, Calpol, Anadin, Lemsip, Day Nurse, Night Nurse, Beechams, and most own-brand cold and flu remedies. Combination products (cold and flu) are particularly dangerous because they contain multiple active ingredients.
If your dog has already eaten paracetamol
Call your vet or the Animal PoisonLine on 01202 509000 IMMEDIATELY. Do not wait for symptoms — by the time symptoms appear (typically 4–12 hours after ingestion), liver damage is already underway. The treatment window for inducing vomiting is very short. Bring the packet so the vet knows exact strength and quantity.
Risks to watch for
- Severe liver damage (hepatic necrosis)
- Methaemoglobinaemia
- Brown or muddy gums
- Vomiting, lethargy, abdominal pain
- Swollen face or paws
- Death within 1–3 days without treatment
What to watch for — and when
4–12 hours: lethargy, vomiting. 12–24 hours: brown/grey gums, swollen face. 24–72 hours: liver failure signs.
Hidden sources to check
- Panadol, Calpol, Anadin, Lemsip, Beechams, Day Nurse, Night Nurse
- Combined codeine + paracetamol products (Co-codamol)
- Cold and flu sachets
- Most own-brand pain relief tablets
Breed-specific notes
- Small breeds at higher risk due to body weight
Safe portion size
There is no safe dose. For genuine pain relief, your vet will prescribe dog-specific NSAIDs (meloxicam, carprofen) that are safe and effective.
Safer alternatives
- Dog-specific prescription pain relief from your vet (meloxicam, carprofen)
- Never use any human painkiller without explicit vet instruction
While you're checking what your dog can safely eat, make sure their flea and worm protection is up to date too.
Common questions
My vet said I could give a small dose — is this still dangerous?
What about junior or infant Calpol?
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