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⚠️ Emergency Tool

Chocolate Toxicity Calculator

Your dog ate chocolate. Don't panic — enter the details below and we'll tell you exactly how serious it is, based on ASPCA theobromine toxicity thresholds. Then we'll tell you what to do next.

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Toxicity Assessment
ASPCA thresholds • Instant result
Severity Assessment
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mg/kg dose
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total theobromine
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toxic threshold
What to do now:
    🚨 Call your vet or the ASPCA Poison Control hotline (US: 888-426-4435) immediately.
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    Why Chocolate Is Dangerous for Dogs

    Chocolate contains theobromine, a methylxanthine compound that dogs metabolise far more slowly than humans. While humans break down theobromine in 2-3 hours, dogs need approximately 17.5 hours — meaning it builds up to toxic levels much more easily.

    The danger depends on three factors: the type of chocolate (darker = more theobromine), the amount eaten, and your dog's body weight. A small dog eating dark chocolate is in far more danger than a large dog eating milk chocolate.

    Theobromine Content by Chocolate Type

    Chocolate TypeTheobromine (mg/g)
    White chocolate0.25
    Milk chocolate2.4
    Semi-sweet / Dark chips5.3
    Dark chocolate (70-85%)8.0
    Baking / Unsweetened16.0
    Cocoa powder (dry)28.5

    Toxicity Severity Levels

    Likely Safe
    Under 20 mg/kg
    Mild GI upset possible. Monitor at home. No treatment usually needed.
    Mild Toxicity
    20 – 40 mg/kg
    Vomiting, diarrhoea, restlessness, excessive thirst and urination. Call your vet.
    Moderate Toxicity
    40 – 60 mg/kg
    Rapid heart rate, muscle tremors, hyperactivity, heavy panting. Veterinary treatment needed.
    Severe Toxicity
    Over 60 mg/kg
    Seizures, cardiac arrhythmias, internal bleeding, collapse. Life-threatening emergency.

    What to Do If Your Dog Eats Chocolate

    1. Stay calm and assess. Note the type of chocolate, approximate amount, and when it was eaten.
    2. Use this calculator. Get an instant read on severity so you know how urgently to act.
    3. Call your vet. Even if the calculator says "likely safe," call if you're unsure. For after-hours, use an emergency vet or the ASPCA Poison Control (US: 888-426-4435, AU: 1300 869 738).
    4. Do NOT induce vomiting unless your vet tells you to. Incorrect vomiting induction can cause aspiration pneumonia.
    5. Monitor for 24 hours. Symptoms can appear up to 12 hours after ingestion due to theobromine's long half-life in dogs.

    Frequently Asked Questions

    It depends entirely on the type. Dark chocolate and baking chocolate are the most dangerous — as little as 15g of baking chocolate per kg of body weight can cause severe symptoms. Milk chocolate is less concentrated but still dangerous in quantity. White chocolate contains negligible theobromine and is unlikely to cause theobromine toxicity (though the fat content can trigger pancreatitis).
    Symptoms typically appear within 6-12 hours of ingestion, but can appear as early as 2 hours. Theobromine has a long half-life in dogs (approximately 17.5 hours), meaning symptoms can worsen over time even without additional ingestion. This is why monitoring for a full 24 hours is important.
    Early signs include vomiting, diarrhoea, restlessness, and excessive urination. At higher doses: rapid breathing, muscle tremors, and elevated heart rate. Severe cases can cause seizures, cardiac arrhythmias, and in rare cases, death. The progression depends on the dose per kilogram of body weight.
    Do NOT induce vomiting without veterinary guidance. If ingestion occurred within the last 2 hours and your vet advises it, they may instruct you to use 3% hydrogen peroxide (1 tablespoon per 5kg of body weight). Never use salt water, mustard, or ipecac syrup. Always call your vet or poison control first.
    White chocolate contains negligible theobromine (0.25 mg/g) and is very unlikely to cause theobromine toxicity. However, the high fat and sugar content can still trigger pancreatitis, especially in smaller dogs or breeds prone to the condition (Miniature Schnauzers, Cocker Spaniels). If your dog ate a large amount of white chocolate, it's still worth calling your vet.

    Sources & References

    All thresholds and theobromine concentrations are sourced from peer-reviewed veterinary toxicology:

    1. 1
      ASPCA Animal Poison Control Center — Chocolate Toxicity
      American Society for the Prevention of Cruelty to Animals • Theobromine dose thresholds
    2. 2
      Merck Veterinary Manual — Chocolate Toxicosis in Animals
      Merck & Co. • Clinical signs, treatment protocols, lethal dose data
    3. 3
      Finlay & Guiton (2005) — Chocolate Poisoning, BMJ
      British Medical Journal • Theobromine pharmacokinetics and species-specific metabolism