Is chocolate toxic to dogs? What to do now

Is chocolate toxic to dogs?

Yes. Chocolate contains theobromine and caffeine, which overstimulate a dog's heart and nervous system. How serious it is depends on the type, the amount and your dog's weight: dark and baking chocolate carry two to seven times more theobromine than milk chocolate, and mild signs are expected from about 20 mg per kg. Until you know the amount, treat it as a same-day vet visit and call your vet now.

Written by the Pativo team · Updated 14 November 2026

General information, not veterinary advice. If your pet may have eaten this, contact a vet now; do not wait for signs.

Go to an emergency clinic now if

Your dog ate baking chocolate, cocoa powder or a lot of dark chocolate

The estimated dose is 40 mg per kg or more

Your dog has a racing or irregular heartbeat, tremors or is very restless

Your dog has a seizure or collapses

The chocolate also contained raisins, macadamia nuts or xylitol

Who to call

Your own vet first. If they are closed, the nearest emergency or out-of-hours clinic.

In the United States

Both answer 24 hours a day and may charge a consultation fee.

How Pativo rates this

Depends on the amount; call a vet today

1Nothing alarmingWatch at home

2Worth watchingMonitor for a few days

3See a vet soonWithin 48 hours

4See a vet todayWithin 24 hours

5EmergencyGo now

This is the level the app answers with before it knows the amount. It comes from the app's own poison list, which runs on your phone.

Sign	Usually starts
Vomiting and diarrhoea	2-12 hours
Increased thirst and urination	6-12 hours
Restlessness, panting, hyperactivity	6-12 hours
Racing or irregular heartbeat	6-12 hours, larger doses
Muscle tremors	6-12 hours, larger doses
Seizures or collapse	Hours; signs can last up to 72 hours

Sign

Usually starts

Vomiting and diarrhoea

2-12 hours

Increased thirst and urination

6-12 hours

Restlessness, panting, hyperactivity

6-12 hours

Racing or irregular heartbeat

6-12 hours, larger doses

Muscle tremors

6-12 hours, larger doses

Seizures or collapse

Hours; signs can last up to 72 hours

Why is chocolate toxic to dogs?

Theobromine is a stimulant in cocoa that dogs clear very slowly. Its half-life in dogs is about 17.5 hours, against 4.5 hours for caffeine, so the effect on the heart, muscles and brain builds and lingers. Chocolate also contains caffeine, which adds to the effect.

The darker and more bitter the chocolate, the more theobromine it holds. Even when the dose is too low to poison, the fat and sugar can cause vomiting, diarrhoea or pancreatitis.

How much chocolate is dangerous for a dog?

Danger is measured in milligrams of theobromine per kilogram of body weight. Veterinary references put mild signs (vomiting, diarrhoea, thirst) at about 20 mg/kg, effects on the heart at 40 to 50 mg/kg, and seizures at 60 mg/kg or more. Pativo uses the same steps, and suggests a vet visit from 10 mg/kg.

Pativo calculates with these theobromine contents per gram: white chocolate 0.1 mg, milk chocolate 2.4 mg, dark chocolate 5.5 mg and baking chocolate 16 mg. The table shows roughly how much of each brings a dog to the mild-signs level (20 mg/kg) and the heart-effect level (40 mg/kg).

Dog weight	Milk, 20 mg/kg	Milk, 40 mg/kg	Dark, 20 mg/kg	Dark, 40 mg/kg	Baking, 20 mg/kg	Baking, 40 mg/kg
5 kg	41 g	83 g	18 g	36 g	6 g	12 g
10 kg	83 g	166 g	36 g	72 g	12 g	25 g
20 kg	166 g	333 g	72 g	145 g	25 g	50 g
30 kg	250 g	500 g	109 g	218 g	37 g	75 g

These figures are approximate and rounded down. Cocoa content varies a great deal between brands. The Merck Veterinary Manual estimates a 65% cocoa bar at about 10 mg of theobromine and caffeine per gram, nearly double the dark chocolate figure above, and cocoa powder at about 28.5 mg per gram. If the wrapper gives a cocoa percentage, tell your vet. Dogs also vary, and one with a heart condition may react to less.

A worked example: a 10 kg dog that eats a 100 g bar of milk chocolate takes in about 240 mg of theobromine, or 24 mg/kg. That is above the mild-signs level and warrants a vet visit today.

You can enter the type, amount and weight in Pativo's poison check, which runs on the phone and works offline.

What will the vet do?

Treatment depends on the dose and how long ago it was eaten. If it was recent and your dog has no signs, the vet may make your dog vomit, mainly within about two hours of eating. For larger doses the vet may give activated charcoal, intravenous fluids, and medicines to control vomiting, tremors and an abnormal heart rhythm, with heart monitoring.

Most dogs recover with treatment. Chocolate is rarely fatal, but severe cases can stay ill for up to three days, and earlier treatment is usually simpler and cheaper.

How do I stop it happening again?

Most cases happen around holidays, when chocolate sits in gift boxes, advent calendars, bags under the tree and baking cupboards.

Keep chocolate, cocoa powder and baking chocolate in a closed cupboard, not on a low table or in a bag on the floor.
Ask visitors and children not to share sweets and to keep wrapped gifts off the floor.
Avoid cocoa bean mulch in gardens your dog can reach.
Check mixed treats: chocolate often comes with raisins, macadamia nuts or xylitol, each of which needs its own advice.

Chocolate is also dangerous for cats. For the signs that mean any pet needs a clinic immediately, see emergency signs.

Questions owners ask

Is white chocolate safe for dogs?

White chocolate contains almost no theobromine, so poisoning is very unlikely. The fat and sugar can still cause vomiting, diarrhoea or pancreatitis, so mention it to your vet if a large amount was eaten.

My dog ate chocolate but seems fine. Can I wait?

Signs usually start 6 to 12 hours after eating, so a dog that looks normal at first can still become ill. Call your vet now with the type, amount and weight; treatment works best before signs appear.

Is cocoa mulch dangerous for dogs?

Yes. Cocoa bean hulls, sold as garden mulch, contain theobromine, and cocoa powder is the most concentrated form of all. Treat either like dark or baking chocolate.