How This Calculator Works
This tool divides the amount of raisins or grapes eaten (in grams) by your dog’s body weight (in kilograms) to estimate a dose in grams per kilogram (g/kg), and compares that dose to ranges reported in veterinary toxicology case literature. As a rough rule of thumb, a single raisin weighs approximately 1 gram.
Why There Is No “Safe” Amount
Unlike some other toxins, grape and raisin toxicosis in dogs appears to be idiosyncratic – published case reports describe kidney injury after doses as low as roughly 0.04-0.1 g/kg in some dogs, while other dogs have eaten much larger amounts without apparent harm. Case series in the veterinary literature have documented acute kidney injury at estimated doses ranging from a few grams per kilogram up into the tens of grams per kilogram. Because no dose has been proven safe for all dogs, this calculator’s dose ranges are reference points only, not a safety cutoff.
- Below 0.1 g/kg: lower than most doses described in published toxicosis case reports, but risk cannot be ruled out for an individual dog.
- 0.1-3 g/kg: within the range associated with toxicosis in some reported cases.
- Above 3 g/kg: within the higher end of doses reported alongside acute kidney injury in case literature.
This tool is for general educational purposes only and does not replace professional veterinary advice. If your dog has eaten any amount of raisins or grapes, contact your veterinarian or an animal poison control hotline right away rather than waiting to see if symptoms develop.