Assess the risk level if your dog ate chocolate, raisins/grapes, or a xylitol-containing product.
For "Custom amount" option above, enter grams directly.
Enter your dog's weight, select the toxin type using the tabs, then fill in what was eaten. For chocolate, choose the specific type - baking chocolate is roughly 40 times more dangerous per ounce than white chocolate due to theobromine concentration. For raisins and grapes, there is no established safe dose, so any ingestion is flagged regardless of amount. For xylitol, select the product type and quantity consumed.
The calculator outputs a severity level from None to Critical, the approximate toxic dose received in mg/kg, the known danger thresholds, and whether you should call a vet immediately. Even a "mild" result warrants monitoring. When in doubt, always call your veterinarian.
The dangerous compounds in chocolate are theobromine and, to a lesser extent, caffeine. Dogs metabolize theobromine far more slowly than humans - the half-life in a dog is 17.5 hours versus about 6-10 hours in humans. This slow clearance allows the compound to accumulate to toxic levels. Theobromine is a methylxanthine that stimulates the central nervous system and heart, causing vomiting, diarrhea, seizures, and in severe cases cardiac arrest.
| Chocolate Type | Theobromine (mg/g) | Risk for 30 lb (14 kg) dog at 1 oz |
|---|---|---|
| White chocolate | 0.85 | Minimal (GI upset only) |
| Milk chocolate | 2.4 | Low (small amount) |
| Semi-sweet / dark | 5.5 | Moderate |
| Bittersweet | 16 | Severe |
| Baking chocolate | 35 | Critical |
| Dry cocoa powder | 28 | Critical |
Unlike chocolate, the toxic compound in grapes and raisins has never been identified. This means there is no dose-response curve and no threshold below which a dose is known to be safe. Some dogs have developed acute kidney failure after eating just a few raisins; others have eaten large amounts without apparent effects. Because the outcome is unpredictable at any dose, veterinary toxicologists classify any ingestion as requiring immediate veterinary evaluation. Currants appear to be similarly or more toxic than raisins.
Xylitol is increasingly common in everyday products: sugar-free gum, some brands of peanut butter, dental chews, vitamins, baked goods, and even some medications. In dogs, xylitol triggers a rapid and exaggerated release of insulin from the pancreas, causing life-threatening hypoglycemia within 30 to 60 minutes. At higher doses, xylitol causes direct liver toxicity independent of blood sugar effects. Liver failure can occur 8 to 12 hours after ingestion. Always check the ingredient label of any human food product before giving it to your dog - the peanut butter danger is especially common since peanut butter is widely used as a treat or medication vehicle.
Toxicity is always about dose relative to body weight. A square of dark chocolate that barely affects a 70-pound Labrador could send a 7-pound Chihuahua to the emergency vet. This calculator factors in your dog's exact weight when assessing the risk level of specific foods and amounts.
Chocolate toxicity depends on the type: baking chocolate has 130-450 mg of theobromine per ounce, while milk chocolate has 44-60 mg. The toxic threshold starts at about 20 mg of theobromine per kilogram of body weight for mild symptoms. This calculator converts between chocolate types and your dog's weight to give you a specific risk assessment, not a generic warning.
For a complete guide to every food dogs should avoid (not just chocolate), including xylitol, grapes, onions, and macadamia nuts, see our full guide on foods toxic to dogs. If your dog has already eaten something dangerous, call your vet or ASPCA Poison Control at (888) 426-4435 immediately.