Pets & Animals

Chocolate Toxicity Calculator for Dogs (Theobromine Dose)

Enter the dog’s weight, the chocolate type and how much was eaten. If in doubt, call your vet or a pet poison line now.

By TheCalcTools Updated Formula checked and tested

Your numbers

A standard milk chocolate bar is often 40 to 50 g; check the wrapper
Unsweetened baking chocolate and cocoa powder are much stronger than dark chocolate; use the USDA value for the product

Your results

Theobromine dose (mg per kg)
Theobromine dose (mg per kg)
—
Theobromine eaten (mg)
—
Risk level
—
Amount that reaches the mild threshold (g)
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Below 20 mg/kgBelow the mild-signs level
20 to 40 mg/kgMild signs
40 to 60 mg/kgHeart effects possible
60 mg/kg or moreSeizures possible

Chocolate Toxicity Calculator for Dogs (Theobromine Dose) by TheCalcTools

How the Chocolate Toxicity Calculator for Dogs (Theobromine Dose) works

Chocolate contains theobromine (and some caffeine), which dogs break down slowly. The Merck Veterinary Manual reports mild signs such as vomiting, diarrhoea and thirst at about 20 mg/kg, heart effects at 40 to 50 mg/kg and seizures at 60 mg/kg or more.

Darker chocolate has much more theobromine: by USDA FoodData Central values, 70% to 85% dark chocolate has about four times as much as milk chocolate. Cocoa powder and baking chocolate are stronger still.

Individual dogs vary, and serious illness can occur below these levels. This is an estimate, not a diagnosis: if your dog ate chocolate, contact a vet straight away.

The formula

Dose (mg/kg) = grams eaten × theobromine per 100 g ÷ 100 ÷ body weight

Worked example

Using the default values shown in the calculator:

Dog's weight (kg)10
Chocolate eaten (grams)100
Chocolate type (theobromine per 100 g)Milk chocolate (about 205 mg)
Theobromine (mg per 100 g)1300
  1. 100 g of milk chocolate contains about 205 mg of theobromine.
  2. For a 10 kg dog that is 20.5 mg/kg: Mild signs likely (vomiting, diarrhoea, thirst): call your vet now.

Result:

Theobromine dose (mg per kg)20.5
Theobromine eaten (mg)205
Risk levelMild signs likely (vomiting, diarrhoea, thirst): call your vet now
Amount that reaches the mild threshold (g)98

Frequently asked questions

How much chocolate is dangerous for a 10 kg dog?

Mild signs start near 20 mg/kg, which is about 200 mg of theobromine: roughly 100 g of milk chocolate or 25 g of 70% to 85% dark chocolate.

Is white chocolate safe?

It has almost no theobromine, but its fat and sugar can still upset the stomach or trigger pancreatitis.

What will the vet do?

If ingestion was recent, vets often induce vomiting and give activated charcoal, then monitor the heart and give fluids.

Sources and further reading

Dog Food Calculator (Calories and Cups per Day)Enter your dog's weight, life stage and the food's calories to find the daily portion Dog and Cat Weight Loss Calculator (Safe Rate and Calories)Enter your pet's current and ideal weight to plan a safe weight-loss programme Dog Age CalculatorHow old is your dog in human years? Two methods side by side Pet Cost Calculator (Yearly and Lifetime Cost)Enter your expected costs to see what a pet will cost each year and over its lifetime

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.