Dog has eaten chocolate
Phone the vet or Animal PoisonLine with the chocolate type, weight, and your dog's weight — toxicity depends on cocoa content; dark and cooking chocolate are far more dangerous than milk.
Recognise the signs
- Witnessed eating, or evidence (wrappers, missing chocolate)
- Restlessness, hyperactivity
- Vomiting, often with chocolate visible
- Diarrhoea
- Excessive thirst and urination
- Trembling, twitching
- Fast heart rate, abnormal heart rhythm
- Seizures, collapse in severe cases
First aid steps
- Phone the vet or Animal PoisonLine on 01202 509000.
- Note the type of chocolate (white, milk, dark, cooking, cocoa powder), brand if possible, and approximate weight eaten.
- Note the time of ingestion.
- Weigh the dog or use a recent weight.
- Bring the wrapper to the vet.
- Do not induce vomiting at home unless told to by a vet.
Do NOT
- Do not induce vomiting at home unless specifically directed by a vet.
- Do not assume small amounts of milk chocolate are harmless to a small dog — small dogs and dark chocolate are the most dangerous combination.
- Do not wait to see if symptoms develop in cases of dark or cooking chocolate.
- Do not give bread, milk, or 'home antidotes'.
- Do not assume cocoa powder or cocoa mulch is less toxic than chocolate bars — both are concentrated and dangerous.
While transporting to the vet
- Bring wrappers and any remaining chocolate.
- Phone ahead — emesis and activated charcoal can be prepared.
- Have the dog's weight ready for accurate dose calculation.
When to phone the vet immediately
- Dark chocolate, cooking chocolate, or cocoa powder ingestion regardless of amount
- Any chocolate ingestion in a small dog (under 10kg)
- Tremors, seizures, abnormal heart rhythm
- Repeated vomiting, weakness, or collapse
- Older dog with heart disease and any chocolate ingestion
Signs that can usually wait for a routine appointment
- A very small amount of milk chocolate in a large dog with no symptoms may be safely monitored at home — but only after speaking to a vet or Animal PoisonLine, who can run the dose calculation. Do not skip the call.
Common causes
- Easter eggs, Advent calendars, Christmas selection boxes
- Birthday cake, chocolate gateau, brownies
- Baking chocolate, cocoa powder, chocolate chips left on counters
- Children's chocolate dropped or shared
- Cocoa mulch in gardens
- Bin-raiding for chocolate wrappers
What the vet will need to know
- Type of chocolate (white, milk, dark percentage, cooking, cocoa powder)
- Brand if known
- Weight of chocolate eaten
- Time of ingestion
- Dog's weight
- Any current symptoms
- Pre-existing heart conditions or medications
Aftercare
- Decontamination if within 2 hours: induced vomiting and activated charcoal.
- IV fluids to support clearance.
- ECG monitoring if heart rhythm affected.
- Anti-seizure medication if needed.
- Most dogs recover fully within 24–48 hours.
- Identify and remove the source at home.
Prevention
- All chocolate in cupboards or up high, not on counters.
- Special vigilance at Easter, Christmas, Valentine's Day, and birthdays.
- Brief children and guests on the rule.
- Use cocoa-mulch alternatives in dog gardens (bark, gravel).
- Lock bin lids.
Breed-specific notes
- Small dogs at higher risk by weight — same chocolate bar is far more toxic to a 5kg Yorkie than a 30kg Labrador.
- Dogs with pre-existing heart disease at higher risk of arrhythmia.
Frequently asked questions
How much chocolate is toxic?
It depends on the cocoa content (theobromine and caffeine concentrations) and the dog's weight. Roughly, dark chocolate becomes toxic at around 1–2g per kg of dog, milk chocolate around 9g per kg. Cocoa powder and cooking chocolate are most concentrated. Online chocolate toxicity calculators give a starting estimate, but a vet phone call confirms the right action for your specific case.
What if my dog ate chocolate hours ago?
Still phone the vet. Decontamination is most effective within 2 hours, but supportive treatment (IV fluids, ECG monitoring, anti-seizure medication) is valuable later. Symptoms can develop 6–12 hours after ingestion.
Is white chocolate dangerous?
White chocolate contains very little theobromine, so toxicity is low. It is, however, high in fat and sugar — pancreatitis risk in susceptible dogs. Vet contact is still wise, but the urgency is much lower than for darker chocolate.