Your dog ate chocolate. How worried should you be?
Chocolate risk depends on the type, the amount and your dog’s weight — a lick of white chocolate and a square of baking chocolate are not the same event. Grapes are a different problem, and this page is straight with you about that.
If your dog has eaten something now, phone first and calculate afterwards
Treatment is far more effective in the first couple of hours. Your own vet is the best call; these lines are open around the clock if you cannot reach them.
- Dose
- — mg methylxanthines per kg
- Total eaten
- — mg theobromine + caffeine
- Signs usually start
- 6–12 h after eating
What to do
What to watch for
Any amount is treated as an emergency. Phone your vet now.
There is no known safe quantity of grapes, raisins, sultanas or currants for dogs. Toxicity does not track the amount eaten the way chocolate does: some dogs eat a large number with no ill effect, while others develop acute kidney injury from a handful. Because there is no way to tell in advance which kind of dog yours is, the veterinary advice is to treat every ingestion as potentially serious.
Why there is no calculator here
Every other tool on this page gives you a number. This one deliberately does not. Grape toxicity does not scale with the amount eaten in any predictable way, so any tool that told you "that much is fine" would be inventing a threshold that does not exist in the literature. The honest output is the same for one grape as for a bag.
What to do
Phone your vet or a poison line immediately, whatever the amount. If it was eaten recently they will usually want to make your dog sick and start intravenous fluids — which works far better before kidney damage begins than after.
What to watch for
- Vomiting, often within a few hours
- Lethargy, weakness or unusual quietness
- Loss of appetite
- Drinking or urinating more than usual — or producing no urine at all
- Abdominal pain
Timing: Vomiting often appears within 6–12 hours. Signs of kidney injury can take 24–72 hours to show, by which point treatment is much harder. A dog that seems well the same evening is not in the clear.
This is general information, not veterinary advice. It cannot examine your dog, and it does not know their history. For anything that concerns you, speak to a vet.
Why the type of chocolate matters more than the amount
Dogs metabolise theobromine far more slowly than people do — its half-life in a dog is roughly 17 hours, against two or three in a human. It accumulates, which is why effects are both stronger and longer-lasting, and why a dog may need supportive care for more than a day.
The concentration varies enormously between products, and that variation swamps everything else:
| Type | Theobromine | Caffeine | Notes |
|---|---|---|---|
| White chocolate | 0.25 mg/oz | 0.85 mg/oz | Barely any methylxanthine. The fat and sugar can still upset a stomach or, in large amounts, trigger pancreatitis. |
| Milk chocolate | 58 mg/oz | 6 mg/oz | The commonest culprit: chocolate bars, buttons, most filled boxes. |
| Dark or semi-sweet | 150 mg/oz | 22 mg/oz | Around three times the strength of milk chocolate. |
| Extra dark (70%+) | 228 mg/oz | 26 mg/oz | Higher cocoa solids mean proportionally more theobromine. |
| Baking chocolate (unsweetened) | 393 mg/oz | 47 mg/oz | One of the most dangerous forms. A single square is a serious dose for a small dog. |
| Cocoa powder | 737 mg/oz | 70 mg/oz | The most concentrated common form. |
| Cocoa bean mulch | 255 mg/oz | 12 mg/oz | Garden mulch made from cocoa shells. Dogs eat it because it smells of chocolate. |
Figures are mid-range estimates. Actual content varies between products and batches, which is one more reason to treat the result as a guide and phone a vet rather than self-diagnose.
What the dose bands mean
| Dose | Generally associated with |
|---|---|
| Under 20 mg/kg | Poisoning signs unlikely. Fat and sugar may still cause vomiting or diarrhoea. |
| 20–40 mg/kg | Vomiting, diarrhoea, thirst, restlessness. |
| 40–60 mg/kg | Racing heart, abnormal rhythms, tremors. |
| Over 60 mg/kg | Seizures and life-threatening rhythms. Doses at this level have been fatal. |
These are thresholds for a typical healthy adult dog. A puppy, an elderly dog or one with heart disease may react at a lower dose, and nobody weighing a half-eaten box can be precise about the amount. Treat the bands as guidance, not permission.
Other things worth knowing about
| Hazard | Why it matters |
|---|---|
| Xylitol (birch sugar) | In sugar-free gum, some peanut butters, baked goods. Causes a dangerous drop in blood sugar and liver failure. Extremely toxic in tiny amounts — treat as an emergency. |
| Onions, garlic, leeks, chives | Damage red blood cells. Cooked, raw or powdered all count, and signs can take days to appear. |
| Macadamia nuts | Cause weakness, tremors and fever, typically within 12 hours. |
| Alcohol and raw bread dough | Dough ferments in the stomach and produces alcohol. Both can be life-threatening. |
| Ibuprofen, paracetamol and other human painkillers | Never give human painkillers to a dog. They cause stomach ulcers and kidney or liver failure. |
Common questions
How much chocolate is toxic to a dog?
It depends on the type far more than the amount. Toxicity tracks methylxanthines — theobromine plus caffeine — per kilogram of body weight. Signs typically begin around 20 mg/kg, heart effects around 40 mg/kg, and seizures around 60 mg/kg. Because cocoa powder carries roughly a hundred times the theobromine of white chocolate, an ounce of one is trivial and an ounce of the other can be an emergency.
My dog ate chocolate but seems fine. Do I still need to call?
Yes. Signs often take 6 to 12 hours to appear, and treatment works far better before they start than after. Decontamination is only an option in the first couple of hours, so waiting to see what happens removes the easiest intervention. A phone call costs nothing and takes five minutes.
How long does chocolate poisoning take to show?
Usually 6 to 12 hours, though restlessness and vomiting can start sooner. Theobromine is cleared slowly by dogs — its half-life is around 17 hours — which is why effects last so long and why dogs sometimes need supportive care for a day or more.
How many grapes are dangerous for a dog?
There is no known safe number, and this is genuinely different from chocolate. Some dogs eat a large quantity with no effect; others develop acute kidney injury from a handful. Because nobody can tell in advance which kind of dog yours is, the veterinary advice is to treat every ingestion — grapes, raisins, sultanas or currants — as an emergency and phone straight away.
Should I make my dog vomit?
Not without being told to by a vet or a poison line. Inducing vomiting is the wrong move in several situations — if the dog is already unwell, having tremors, or if a caustic substance is involved — and home methods like salt can themselves be dangerous. Phone first; they will tell you whether to do it and how.
Is white chocolate safe?
It contains almost no theobromine, so methylxanthine poisoning is unlikely. That is not the same as safe: the fat and sugar can cause significant stomach upset, and in larger amounts pancreatitis, which is serious in its own right. Wrappers and foil bring their own risk of obstruction.