Free dog safety tool
How much chocolate is toxic to my dog?
Enter your dog's weight and how much of which chocolate it ate. You get an estimated theobromine dose, a risk band and exactly who to call. If your dog is already unwell, skip the maths and phone a vet or a poison line now.
If your dog ate chocolate, call now
You do not need a diagnosis to make the call. Phone your own vet first if you can; otherwise an animal poison-control line:
Estimate the dose
Two to three times the theobromine of milk chocolate. Chocolate chips and most dark bars sit here.
Mild-to-moderate poisoning likely
Around 20 mg/kg and up: vomiting, diarrhoea, restlessness, extreme thirst and a faster heartbeat.
Call your vet or a poison-control line now and tell them the amount and type. Do not wait for signs to show up first.
About 312 mg of theobromine from 2 oz of Dark / semisweet chocolate & chips.
For a 30 lb dog, about 1.7 oz of this reaches the ~20 mg/kg level where signs usually begin.
Chocolate also contains caffeine, which adds to the effect, so treat a borderline result as worse, never better.
How this is worked out
Chocolate is toxic to dogs because of theobromine (and a smaller amount of caffeine) — stimulants dogs clear from the body far more slowly than we do.
The calculator multiplies how much your dog ate by the theobromine in that type of chocolate, then divides by your dog's weight to get a dose in milligrams per kilogram. That dose is what decides the risk, not the number of squares.
It then places the dose against the thresholds vets use. Because caffeine adds to the effect and a scared owner's estimate of 'how much' is rarely exact, a result near a threshold should be treated as the worse side of it.
The risk bands
Theobromine dose in milligrams per kilogram of your dog's body weight (Merck/MSD, VCA, ASPCA).
Below the usual signs threshold
Under about 20 mg/kg, poisoning signs are uncommon — but mild stomach upset is still possible, and this is an estimate, not an all-clear.
Mild-to-moderate poisoning likely
Around 20 mg/kg and up: vomiting, diarrhoea, restlessness, extreme thirst and a faster heartbeat.
Serious — cardiac effects likely
Around 40 mg/kg: a racing or irregular heartbeat, agitation and muscle twitching on top of the stomach signs.
Severe — tremors and seizures
Around 60 mg/kg and above: tremors and seizures, and it becomes life-threatening — roughly 100–200 mg/kg can be fatal.
Which chocolate is most dangerous
Theobromine per ounce, from the type you pick. Darker means more.
| Chocolate | Theobromine / oz | Notes |
|---|---|---|
| White chocolate | ~7 mg | Almost no theobromine — but the fat and sugar can still bring on vomiting or even pancreatitis, so it is not a free pass. |
| Milk chocolate (bars, most sweets) | ~57 mg | The everyday chocolate in bars, buttons and filled sweets. Moderate theobromine — a real risk in the amount a dog can bolt in seconds. |
| Dark / semisweet chocolate & chips | ~156 mg | Two to three times the theobromine of milk chocolate. Chocolate chips and most dark bars sit here. |
| Baking (unsweetened) chocolate | ~425 mg | The most concentrated solid chocolate in a kitchen — a single small square is already a large dose. |
| Cocoa powder (dry, unsweetened) | ~624 mg | Gram for gram the worst of the lot — even a couple of spoonfuls are packed with theobromine. |
Signs of chocolate poisoning
Usually 6–12 hours after eating, and they can last for days.
- Vomiting or diarrhoea
- Restlessness, pacing or hyperactivity
- Extreme thirst and more urinating than usual
- A racing, pounding or irregular heartbeat
- Muscle tremors or twitching
- In bad cases: seizures, collapse or a dangerously high temperature
What to do if your dog ate chocolate
- Take the chocolate away and note the type (milk, dark, baking, cocoa) and roughly how much is gone — the wrapper helps.
- Work out your dog's weight and use the calculator above for a rough dose.
- Call your vet or one of the poison lines now with those details. Do this even for a low estimate, and especially for dark, baking or cocoa chocolate.
- Do NOT try to make your dog vomit or give any home remedy unless a vet on the phone tells you to — doing it wrong can cause its own emergency.
- If your dog is already twitching, unsteady, having a seizure or collapsing, skip ahead and go straight to the nearest emergency vet.
Sources
Common questions
Is a tiny bit of chocolate really dangerous for a dog?
It depends on the type, the amount and your dog's weight — which is exactly what the calculator works out. A lick of milk chocolate off a small biscuit rarely reaches a toxic dose for a large dog, but the same amount of dark or baking chocolate in a small dog can. Estimate the dose, and when in doubt, call.
Which chocolate is worst for dogs?
Dry cocoa powder and baking (unsweetened) chocolate carry the most theobromine per gram, then dark and semisweet, then milk. White chocolate has almost none — but its fat and sugar can still upset a dog's stomach.
How long after eating chocolate do symptoms start?
Usually within 6 to 12 hours, and theobromine lingers, so signs can last days. Do not wait for symptoms before calling — it is easier to treat early.
My dog seems fine. Do I still need to call?
Signs often take hours to appear, so 'seems fine' right now does not mean safe. If the estimated dose is anything but minimal, or it was dark, baking or cocoa chocolate, or you are unsure how much — call your vet or a poison line. This tool estimates exposure; only a vet can judge your dog.
Should I make my dog vomit?
Not on your own. Making a dog vomit can be dangerous if done wrong or at the wrong time. Only do it if a vet or poison-control professional on the phone tells you to, and follows it with proper care.
More free dog tools
Once the emergency's handled, these help with the everyday stuff.
This calculator gives a rough estimate to help you act fast. It is not a diagnosis and does not replace a vet. When a dog has eaten chocolate, call your vet or an animal poison-control line — they decide what your dog needs.
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