Dog ate chocolate? Check how much is dangerous
How dangerous chocolate is depends on three things: the kind, the amount and your dog's weight. Darker is stronger, so an ounce of baking chocolate holds about 7 times the stimulant of milk chocolate. Use the calculator below. If your dog is already vomiting, shaking or restless, skip it and call a poison line now.
Written by Justin Alcalde, AHA and American Red Cross instructor, CPR West Covina · Reviewed
Chocolate calculator
Not sure? Enter the most it could have been.
Enter your dog's weight and the amount to see the result.
A guide, not a diagnosis. Brands vary, and some dogs react at lower amounts. Numbers from the Merck Veterinary Manual.
What do I do if my dog ate chocolate?
Move the rest away
Keep the wrapper: it shows the kind and the weight.
Work out the dose
Use the calculator, or note the kind, amount and your dog's weight.
Call a poison line
ASPCA (888) 426-4435 or Pet Poison Helpline (855) 764-7661.
Leave vomiting to the vet
Only at home if no vet is near and a vet or poison line says so.
Go if told, or if signs start
Vomiting, shaking or a racing heart: drive to the vet now.
Call even if your dog seems fine. For a dog that still looks normal, Merck says vets consider making it vomit when the chocolate was eaten within about 2 hours, so the first couple of hours give the most options.
The 2026 RECOVER First Aid Guidelines advise against making a dog vomit at home after it eats something toxic. They allow it only when you cannot reach a vet quickly and a vet or poison line recommends it. Hydrogen peroxide, the usual home remedy, can injure the stomach. For the next scare, PetAid, our free iPhone app, keeps poisoning first aid steps in your pocket.
How much chocolate is dangerous for a dog?
Merck measures the danger in milligrams of stimulant per kilogram of your dog's weight. The stimulants are theobromine and a little caffeine. Mild signs can start around 20 mg per kg. Heart effects can appear from 40 to 50 and seizures from 60. Merck lists 100 to 200 as a dose that can kill, and notes deaths can happen at much lower doses.
| Chocolate | 10 lb dog | 20 lb dog | 40 lb dog | 60 lb dog | 80 lb dog |
|---|---|---|---|---|---|
| White chocolate | Not realistic | Not realistic | Not realistic | Not realistic | Not realistic |
| Milk chocolate | 1.4 oz (40 g) | 2.8 oz (80 g) | 5.7 oz (161 g) | 8.5 oz (241 g) | 11.3 oz (321 g) |
| Dark or semisweet | 0.6 oz (16 g) | 1.1 oz (32 g) | 2.3 oz (64 g) | 3.4 oz (96 g) | 4.5 oz (129 g) |
| Unsweetened baking | 0.2 oz (6 g) | 0.4 oz (12 g) | 0.8 oz (23 g) | 1.2 oz (35 g) | 1.6 oz (47 g) |
| Cocoa powder | 0.1 oz (3 g) | 0.2 oz (6 g) | 0.4 oz (13 g) | 0.7 oz (19 g) | 0.9 oz (25 g) |
The amount eaten that reaches 20 mg per kg, where Merck reports mild signs. Heart effects start at about 2 to 2.5 times these amounts, and seizures at about 3 times. Dark chocolate uses the top of Merck's range. Brands vary, so call anyway.
Which chocolate is the most dangerous for dogs?
The darker and more bitter, the stronger. Per ounce, Merck lists about 1 mg of stimulant in white chocolate, 64 mg in milk chocolate, 150 to 160 mg in dark or semisweet, 440 mg in unsweetened baking chocolate and 807 mg in cocoa powder.
Gram for gram, cocoa powder carries about 12 times the stimulant of milk chocolate. That is why a small dog in the baking cupboard worries vets more than a big dog with a candy bar.
Cocoa mulch counts too. Garden mulch made from cocoa bean hulls can hold up to about 255 mg per ounce, though some brands remove it, and Merck reports deaths in animals that ate it. White chocolate has almost no stimulant, but it is still rich, and Merck notes that the fat in chocolate may trigger pancreatitis in some dogs.
What are the signs of chocolate poisoning in dogs?
Signs usually start within 6 to 12 hours. Early on, Merck lists thirst, vomiting, diarrhea, a swollen belly and restlessness. These can move on to hyperactivity, peeing more, wobbling, stiff muscles, tremors and seizures. The heart can race or beat unevenly, and breathing can speed up.
Chocolate leaves a dog's body slowly: Merck says it takes about 17.5 hours to clear half of the theobromine. In severe cases, signs can last up to 72 hours, so a dog that is restless tonight may still need care tomorrow.
Get to the vet now if
Your dog is shaking, wobbling, panting hard or has a racing heart, collapses or has a seizure, or the calculator shows heart effects or worse. Bring the wrapper.
What about brownies, cookies and trail mix?
Baked goods are hard to judge, because the stimulant depends on how much chocolate or cocoa went into the recipe. Tell the poison line what the treat was, the recipe or package if you have it, and how much is missing.
Read the label for other ingredients too. Pet Poison Helpline notes that chocolate candy and baked goods may also contain macadamia nuts, raisins or xylitol, and each of those changes the advice. Our guide to foods toxic to dogs covers what each one does.
What will the vet do?
If your dog still seems normal and the chocolate was eaten recently, the vet may make it vomit at the clinic. Fluids from the vet can help flush the stimulant out in the urine. Merck describes medicines for a fast or uneven heartbeat and for tremors or seizures, with the heart watched on a monitor.
Bring the wrapper, your best guess of the amount and the time it happened. That is exactly the math the calculator does, and it helps the team decide how much treatment your dog needs.
Learn it properly
American Red Cross Cat and Dog First Aid, online at your own pace. $50, certificate when you finish.
Start the course
Keep the steps on your phone
PetAid for iPhone, for dogs, cats, rabbits, birds, fish and reptiles. Free on the App Store.
Get PetAidQuestions people ask
Is the calculator a diagnosis?
No. It applies Merck's average figures to the numbers you enter. Products vary, and some dogs react to less, so call a poison line or your vet if you are unsure.
What if I do not know how much was eaten?
Enter the most it could have been, such as the full weight on the package. Give the poison line the same number, plus the time you found it.
Can chocolate kill a dog?
It can. Merck lists 100 to 200 mg per kg as a dose that can be fatal, 5 to 10 times the level for mild signs, and notes deaths can happen at much lower doses. For a 20 lb dog, 100 to 200 mg per kg is roughly 1 to 2 ounces of cocoa powder.
Does this work for cats?
No. Merck says chocolate poisoning is most common in dogs, but many species are susceptible, and these figures are for dogs. For a cat, call a poison line and see our cat toxic foods guide.
More pet first aid
- Toxic foodsChocolate by weight, grapes, xylitol.
- SeizureTime it, hands off. Still going at 3 minutes? Go.
- Cat toxic foodsLilies first, then onions, garlic and pain pills.
- Pet first aid kitHome and trail checklists, and both poison line numbers.
- All dog first aidNormal vitals and every emergency guide.
- Pet first aid, all petsPick your pet.
This is first aid, not veterinary care. Get to a vet or an emergency animal hospital as soon as the steps are done.
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