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What is Chocolate Poisoning?
Chocolate toxicity
This page is for information and reference purposes only.
It is not a substitute for professional veterinary advice, diagnosis, or treatment.
Always speak to a qualified veterinary surgeon about your pet’s individual needs before starting, changing, or stopping any treatment.
What is Chocolate Poisoning?
Chocolate toxicity is one of the most common poisonings in dogs. Chocolate contains theobromine (and smaller amounts of caffeine), substances that dogs cannot break down efficiently. This makes even small amounts potentially dangerous, especially dark chocolate, baking chocolate, and cocoa powder.
The severity depends on:
Type of chocolate (dark > milk > white)
Amount eaten
Size of the dog
Why is Chocolate Toxic to Dogs?
Dogs metabolise theobromine much more slowly than humans.
Theobromine stimulates the heart, nervous system, and muscles.
High levels cause overstimulation of the heart and brain, leading to serious symptoms.
Toxic doses (approximate):
Milk chocolate: 20g per kg of body weight
Dark chocolate: 5–10g per kg
Cocoa powder: even smaller amounts are very dangerous
A small terrier eating one chocolate bar can become seriously ill, while a large Labrador might only get mild signs from the same amount.
Main Signs of Chocolate Poisoning
Signs usually appear within 2–4 hours (can be up to 12 hours):
Vomiting and diarrhoea
Restlessness, hyperactivity, or pacing
Excessive thirst and urination
Fast or irregular heartbeat
Tremors or shaking
Seizures (in severe cases)
High temperature
Collapse or coma (very severe cases)
How We Treat Chocolate Poisoning
Act fast — the sooner treatment starts, the better the outcome.
Treatment at the vet:
Induce vomiting (if eaten within last 2–4 hours).
Give activated charcoal to absorb remaining toxin.
Intravenous fluids to support the kidneys and help flush out theobromine.
Medications to control vomiting, seizures, and heart rhythm.
Hospital monitoring (often 24–48 hours) for moderate to severe cases.
Most dogs recover well with prompt treatment, but severe cases can be fatal.
Take Home Messages
Chocolate is never safe for dogs — even small amounts should be treated as an emergency.
Dark chocolate, cooking chocolate, and cocoa are the most dangerous.
Keep all chocolate, sweets, and cocoa powder well out of reach (including Easter eggs, advent calendars, and baking supplies).
If you suspect your dog has eaten chocolate, contact your vet or an animal poison helpline immediately — do not wait for signs to appear.
Prevention is the best treatment — educate the whole family, especially children.
This information is for reference only and should not replace advice from a qualified veterinary surgeon. Always speak to your vet before starting, changing, or stopping any treatment for your pet.
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