Dog Grape Toxicity Calculator

How it is calculated

The tool divides the amount eaten by the dog's body weight and compares it with a fixed concern threshold: dose = grams ÷ weight in g/kg. The threshold is 0.7 g/kg when the type is fresh grapes and 0.1 g/kg when it is raisins. From that it also gives the amount that would reach the threshold for this particular dog (threshold × weight, in grams) and the dose as a percentage of the threshold (dose ÷ threshold × 100). Weight is in kilograms and the amount eaten in grams. A weight of zero or below, a weight above 200 kg, or a negative amount gives no result. Any type other than raisin is treated as fresh grapes. The thresholds are a screening guideline, not a safe dose: the tool does not say any amount is safe, and a result below 100% does not rule out poisoning.

Common mistakes

• Leaving the type on grapes when the dog ate raisins. Raisins use a threshold seven times lower, so the percentage of threshold is seven times higher for the same grams.
• Entering the number of grapes instead of grams. The field takes grams, so weigh the fruit or estimate the mass rather than typing a count.
• Entering the dog's weight in pounds. The field is in kilograms, so a 22 lb dog is about 10 kg, and typing 22 understates the dose by more than half.
• Reading a result below 100% as proof the dog is safe. The tool compares against a guideline level only, and individual dogs react unpredictably, so low percentages still call for contacting a vet.
• Entering a wrong weight, such as the owner's or a pound figure. Any value up to 200 kg is accepted and simply scales the result, so a too-large weight gives a falsely low percentage; check the weight field before trusting the output.