Chocolate toxic to dogs: the real doses

A box of pralines left on the coffee table, ten minutes of distraction, and the question lands: how bad is this? Yes, chocolate is toxic to dogs, because of the theobromine in cocoa. But how bad can be calculated, and it comes down to three numbers: the dog's weight, the type of chocolate and the amount. Here is how to run that calculation in thirty seconds.

Is chocolate really toxic to dogs?

Yes, and it is not an urban legend. The molecule responsible is theobromine, an alkaloid found in the cocoa bean, from the same family as caffeine.

In humans, the liver clears it in two to three hours. In dogs, the metabolism is far slower: the Belgian Poison Centre sheet gives a plasma peak at around 10 hours and a half-life of 17.5 hours. Theobromine therefore accumulates, stimulating the central nervous system and the heart muscle, and trouble can appear long after the owner has stopped worrying.

That is the point the reassuring articles miss: a dog that seems fine two hours after eating chocolate proves nothing. Monitoring is counted in tens of hours, not minutes.

How much chocolate is toxic to a dog?

The answer is never expressed in grams of chocolate, but in milligrams of theobromine per kilo of dog. That is what makes most answers found online unusable: without the animal's weight, a figure means nothing.

The four reference thresholds, as published by the Belgian Poison Centre:

These thresholds come from the veterinary literature and carry an acknowledged margin of uncertainty. A study cited by the Centre, on mixed-breed dogs, produced no deaths at 200 mg/kg, and a single death out of four dogs at 300 mg/kg. Sensitivity varies widely between animals — all the more reason not to play statistician with your own dog.

That leaves the second half of the calculation: how much theobromine is in the chocolate involved?

How many Belgian pralines does it take to reach the threshold?

This is the conversion nobody makes, and yet it is the only one that speaks to a Belgian household. Nobody has "95 grams of milk chocolate" at home: they have a ballotin, an opened bar, what is left of Saint Nicholas.

I weighed the contents of a 250 g Leonidas ballotin bought in March 2026: 21 pralines, 11.9 g on average, the lightest at 9.4 g and the heaviest at 14.2 g. Formats are comparable at Neuhaus. On that basis, a 12 g praline on a worst-case reading — counting it as if it were entirely milk chocolate at 2.1 mg/g — carries at most 25 mg of theobromine.

The assumption is deliberately pessimistic. In real life, the inside of a praline is praline paste, ganache or marzipan: sugar, hazelnut, cream, none of which contain theobromine. The shell often accounts for only a third of the weight. The real figure is therefore lower — but when a dog is involved, you calculate for the worst case.

Number of pralines needed to reach 20 mg/kg, on a worst-case basis (praline counted as 100% chocolate, milk at 2.1 mg/g and dark at 8.8 mg/g). Thresholds: Belgian Poison Centre.

Two lessons jump out. First: a whole ballotin swallowed by a small dog is not an incident, it is an emergency. Second: size changes everything. The same box that puts a chihuahua in danger leaves a German shepherd below the first threshold — which does not mean you should let it happen, since the fat and sugar take care of the rest.

A 250 g box of milk pralines works out at 53 mg of theobromine per kilo in a 10 kg dog. The severe-symptom threshold sits at 40.

Dark, milk or white: which chocolate is the most dangerous?

The ranking follows the cocoa content, and the gap is wider than most people imagine. Gram for gram, dark chocolate is roughly four times as toxic as milk chocolate, and unsweetened cocoa powder dwarfs everything else.

The Belgian Poison Centre table gives the amount of product needed to reach 20 mg/kg:

In everyday terms: 23 g of dark chocolate is two and a half squares of a 100 g bar. A whole bar of 70% dark takes a 10 kg dog past the lowest known lethal dose. A 200 g Côte d'Or milk bar, by contrast, puts it at around 42 mg/kg: serious, but in another league.

The real trap in a Belgian cupboard is neither the bar nor the ballotin. It is unsweetened cocoa powder, the kind kept for baking: five grams, barely two teaspoons, is enough for a 10 kg dog. Nibs and whole beans, increasingly common in bean-to-bar workshops, are worse still.

What are the symptoms of chocolate poisoning?

They come in two waves, and it is the gap between them that catches owners out. First signs usually appear 2 to 4 hours after ingestion, sometimes only 6 to 12 hours later, as AniCura Belgium points out.

First wave, 2 to 4 hours: unusual restlessness, vomiting, diarrhoea, drooling, more frequent urination, panting, a faster heart rate, rising body temperature.

Second wave, a few hours later, in severe cases: tremors, muscle rigidity, unsteady gait, cardiac arrhythmias, seizures, coma. The Poison Centre notes that death can occur within 18 to 24 hours of the onset of arrhythmias.

A dog showing no symptoms is therefore not a dog in the clear. The usual veterinary rule is 24 to 48 hours of monitoring, which corresponds roughly to three half-lives of the molecule.

My dog ate chocolate: what to do in the first hour?

Six steps, in this order. None needs any equipment, and the first matters far more than the rest.

1. Call your vet, immediately. Even if the dog seems fine, even if the amount looks trivial. They make the call, not a table — this one included.
2. Note the time of ingestion, as precisely as you can. The window in which inducing vomiting is useful is short, in the order of two to four hours depending on the protocol.
3. Identify the product and keep the packaging. "Chocolate" is not enough: dark or milk, cocoa percentage, weight printed on the box. The difference between the two is a factor of four.
4. Estimate how much was actually eaten. Count the missing pralines, weigh what is left of the box. An approximate figure beats a vague impression.
5. Never induce vomiting yourself. No salt, no hydrogen peroxide, no remedy found on a forum: these injure the oesophagus and the stomach. Induced vomiting is a veterinary act, given by injection.
6. Monitor for 24 to 48 hours, overnight included, and call back at the slightest change in behaviour.

Which Belgian sweets contain no cocoa at all?

Some good news in all this: several Belgian classics pose no theobromine problem whatsoever, simply because they contain no cocoa.

The cuberdon is cooked sugar and gum arabic — zero theobromine, apart from the chocolate-coated versions now increasingly on sale. Speculoos is a brown-sugar and spice dough. Marzipan is almond and sugar. So are fruit jellies. And white chocolate contains only cocoa butter, no cocoa mass: which is exactly why its theobromine content falls to 0.009 mg/g.

Zero theobromine does not mean harmless, and that needs saying plainly. These products are extremely fatty and sugary, which remains a classic cause of vomiting, diarrhoea and, in unlucky cases, pancreatitis. None of them belongs in a dog bowl. They simply spare you the emergency.

Is chocolate also dangerous for cats?

The mechanism is identical, but the real-world risk is far lower — for a purely biological reason. Cats cannot taste sweetness: they lack a functional receptor for it, and an open box of pralines does not draw them the way it draws a dog.

Feline poisonings do happen all the same, usually through fat rather than sugar: a chocolate cream, the bottom of a mousse, spilled cocoa powder. The thresholds and the response are the same, with one obvious aggravating factor: a cat weighs four or five kilos, so the dose per kilo climbs very fast. Two squares of dark chocolate in a 4 kg cat already clears the first threshold.

Storing chocolate when you live with a dog

This is where I can be useful, because it is my job and not the vet's. Two periods concentrate most Belgian accidents: Easter, with eggs hidden in the garden, and the Saint Nicholas to Christmas stretch, with open boxes sitting on coffee tables for three weeks.

The egg hunt is the worst possible scenario: chocolate on the ground, in the grass, out of sight, and a dog with a nose fifty times sharper than yours. Count the eggs before hiding them and count them again afterwards — it is tedious, it works, and I have seen enough families panicking on an Easter Sunday to stop finding it excessive. Our Easter chocolate ideas apply to households with dogs too: favour large hollow figures, harder to swallow whole, over small eggs scattered about.

The rest of the year, three habits are enough. Keep chocolate high up and in a closed box, which is the right way to store it anyway — our Belgian chocolate storage guide doubles as a safety measure. Never leave an open ballotin on a coffee table, the ideal height for a labrador. And keep cocoa powder at the top of the cupboard rather than on the worktop: it is the most concentrated product in the house, and the least watched.

Curious about which chocolate deserves a place in your cupboard, out of reach of curious noses? Our ranking of Belgian chocolatiers and our guide to choosing a Belgian chocolatier are a good place to start.