My dog ate chocolate — what do I do?
Chocolate contains theobromine, which dogs metabolize about three times slower than humans. Dark, baking, and cocoa-powder forms are the most dangerous — but milk chocolate at a high enough dose is still an emergency. Call your vet now and read the steps below while you wait.
EmergencyASPCA Animal Poison Control (US, 24/7): (888) 426-4435
Signs to watch for
- Vomiting (often within 2–6 hours)
- Diarrhea
- Restlessness, pacing, unusual hyperactivity
- Excessive thirst and frequent urination
- Rapid heart rate or pounding pulse
- Tremors or muscle stiffness
- Seizures (severe cases)
- Collapse or heart arrhythmia (life-threatening)
Timeline
Why is chocolate toxic to dogs?
Chocolate contains two methylxanthines — theobromine and caffeine — that dogs metabolize roughly three times slower than humans. The slow processing means toxic blood levels build up after even modest amounts.
Theobromine is the bigger problem (about eight times more concentrated than caffeine in most chocolate). It overstimulates the heart, kidneys, and central nervous system. At high enough doses it triggers arrhythmias, seizures, and — rarely — cardiac arrest.
Concentration varies massively by chocolate type. Per gram: baking chocolate has roughly 16 mg of theobromine, dark chocolate around 5–10 mg, milk chocolate around 2 mg, and white chocolate under 0.1 mg. Cocoa powder is even higher than baking chocolate. That is why one chocolate-chip cookie matters less than one square of baker's chocolate of the same weight.
How much chocolate is toxic?
Standard veterinary thresholds (per kg of dog body weight): mild toxicity 20–40 mg of theobromine, moderate 40–60 mg, severe 60+ mg. Severe doses can be fatal.
For a 10 kg (22 lb) dog, mild toxicity starts at roughly 20 g of dark chocolate or 100 g of milk chocolate. Moderate at roughly 40 g of dark or 200 g of milk. Severe at roughly 60 g of dark or 300 g of milk. For a 5 kg toy breed, halve those numbers. For a 30 kg lab, multiply by three.
Use our chocolate-toxicity calculator to get a precise dose estimate by weight, chocolate type, and amount eaten. It uses the same formula vets use to triage. Have the wrapper handy — % cacao, brand, and total weight all change the answer.
What to do right now
1. Call your vet or the ASPCA Animal Poison Control ((888) 426-4435, 24/7) immediately. Have your dog's weight, the chocolate type (read the wrapper), and the amount eaten ready.
2. Run the chocolate-toxicity calculator while you dial — it tells you the rough dose against the toxic threshold so the vet can triage your call faster.
3. Do not induce vomiting at home unless your vet specifically tells you to. Wrong dose or wrong method can damage the esophagus or cause aspiration pneumonia.
4. Bring the wrapper if you can. % cacao, total weight, and brand all matter for an accurate dose calculation.
5. Drive to the clinic if instructed. Early decontamination changes the prognosis dramatically.
Which chocolate is worst?
Ranked from most to least dangerous per gram: cocoa powder, then baker's chocolate, then 70%+ dark chocolate, then 50% dark chocolate, then milk chocolate, then white chocolate.
White chocolate has so little theobromine that acute toxicity is rare — but the high fat content can trigger pancreatitis, which is a separate emergency. Treat white chocolate as "not safe", just less acutely poisonous.
Hidden sources matter too: chocolate-covered nuts, cocoa mulch (a common garden product made from cacao bean shells), chocolate liqueurs, and energy bars with cacao nibs. Some "sugar-free" or "keto" chocolate brands use xylitol as a sweetener — if your dog eats one of those, both theobromine and xylitol are in play, which is worse than either alone.
When can I stop worrying?
If your vet confirms the dose was below the mild-toxicity threshold AND your dog stays asymptomatic for 12 hours, you are usually in the clear. First-time symptoms appearing more than 12 hours after ingestion are uncommon — but if your dog ate a known toxic dose, you should still be in vet care during that window.
If treatment was given, expect follow-up bloodwork at 24–48 hours to confirm kidney and liver values are normal. Theobromine's cardiovascular effects can echo for up to 72 hours, so a brief activity restriction (no off-leash sprints, no fetch) is sensible during recovery.
What not to do
- Do not wait to see if symptoms develop — the decontamination window closes within 2 hours of ingestion.
- Do not induce vomiting at home with salt or hydrogen peroxide. The dose is hard to get right and the wrong amount can injure your dog.
- Do not give milk, bread, or food to "dilute" the chocolate — this can delay treatment and may worsen GI signs.
- Do not assume "a little chocolate is fine for a small dog". Small dogs hit toxic dose thresholds with far less chocolate than large dogs — the math runs the wrong way.
- Do not skip the call because it was milk chocolate. A large enough dose of milk chocolate is still life-threatening.
Frequently asked
My dog ate a small piece of milk chocolate — should I worry?
It depends on your dog's weight and the exact amount. A 25 kg dog eating one square (around 5 g) of milk chocolate is likely fine. A 3 kg toy breed eating the same square may be approaching mild toxicity. Run the calculator and call your vet if the result is anything above 'Likely safe'.
How long does chocolate poisoning take to show?
Early symptoms (vomiting, restlessness, thirst) usually appear within 2–6 hours. Cardiac signs (rapid heart rate, arrhythmia) and tremors may follow at 6–12 hours. Severe cases can develop seizures within 12–24 hours.
Will my dog need to go to the hospital?
Mild toxicity is often managed with at-home monitoring after vet-induced vomiting and a single dose of activated charcoal. Moderate-to-severe cases need IV fluids and cardiac monitoring, usually 24–48 hours hospitalization. The calculator and your vet decide which category your case is in.
Is dark chocolate worse than milk chocolate for dogs?
Yes — significantly. Dark chocolate has roughly five times more theobromine per gram than milk chocolate. A 10 kg dog can show mild toxicity from about 20 g of dark chocolate, but needs around 100 g of milk chocolate to reach the same threshold.
Can chocolate actually kill a dog?
Yes, at high enough doses. Fatal poisoning is uncommon when treated early but does happen — usually with very small dogs eating baking chocolate or large amounts of dark chocolate. The earlier the vet sees your dog, the better the outcome.
What if my dog ate chocolate hours ago and seems fine?
Still call the vet — and run the calculator first. Some dogs do not show symptoms until peak theobromine levels at 6–12 hours, by which point IV-fluid treatment is harder. Blood tests can confirm whether your dog absorbed a dangerous dose even if outward symptoms have not appeared yet.
Is white chocolate safe for dogs?
It contains very little theobromine and is rarely acutely toxic — but the high fat content can trigger pancreatitis, especially in dogs prone to it (cocker spaniels, miniature schnauzers, or any breed with a previous pancreatic episode). Treat it as "not safe", just less acutely dangerous.
Primary sources
This guide draws on the following authorities. Specific clinical decisions for your pet should always be made with your vet.
Double-check another food, get a personalised follow-up, or talk to CRO about your pet’s specific situation.
This guide is educational and based on US veterinary sources (ASPCA APCC, AVMA, and peer-reviewed literature). It is not a substitute for a vet call. When in doubt, phone your vet or the ASPCA Animal Poison Control — the fee is far cheaper than a delayed case.