Dog Grape & Raisin Toxicity Calculator
Your dog got into grapes, raisins, sultanas or currants? Enter their weight and how many to see the risk level and exactly what to do next.
Any variety — seeded or seedless, peeled or not.
Enter your dog's weight and how much they had to see the risk.
- ASPCA Animal Poison Control: (888) 426-4435 · US (fee may apply)
- Pet Poison Helpline: (855) 764-7661 · US/Canada (fee may apply)
This is an estimate to help you decide whether to call, not a diagnosis. When the amount is uncertain or your pet is small, young or unwell, treat it as more serious and pick up the phone.
Estimate only — not veterinary advice. Every animal is different; for a medication dose, a possible poisoning, or any emergency, call your veterinarian or an animal poison control line right away.
Why this calculator won't give you an “all clear”
Most toxins have a dose you can stay under. Grapes and raisins don't — the toxic dose is idiosyncratic, meaning it varies unpredictably from dog to dog. That's why this tool is honest about it: even a small amount lands as “call for advice” rather than “you're fine.” It uses your dog's weight and the amount to estimate where you sit relative to doses that have caused kidney injury, but the safest reading of any real ingestion is to pick up the phone.
Raisins are far worse than fresh grapes
Raisins, sultanas and currants are dried grapes, so the tartaric acid is concentrated into a much smaller, easier-to-eat package — roughly four to five times stronger gram for gram. A spilled box of raisins or a dropped slice of fruitcake is a bigger emergency than the same weight of fresh grapes. The calculator accounts for that difference when you choose the type.
What to do right now
- Don't wait for symptoms. Note what and how much, and when.
- Call your vet or a poison line (ASPCA 888-426-4435, Pet Poison Helpline 855-764-7661).
- Don't induce vomiting on your own unless a professional tells you to and your dog is alert.
- Bring the packaging if there is any, so the vet can see the type and amount.
Frequently asked questions
- How many grapes or raisins are toxic to a dog?
- There is no proven safe number. Grape and raisin poisoning is idiosyncratic — some dogs eat a handful with no effect, while others develop kidney failure from just a few. Because you can't tell in advance which dog yours is, the standard veterinary advice is to treat any real ingestion as a reason to call. Raisins, sultanas and currants are dried and far more concentrated than fresh grapes, so it takes fewer of them.
- What makes grapes and raisins poisonous?
- For years the exact toxin was unknown. Research now points to tartaric acid (and potassium bitartrate), which dogs are unusually sensitive to — it can cause sudden acute kidney injury. Tartaric acid levels vary between grape varieties and ripeness, which is likely why the same amount harms one dog and not another.
- My dog ate one grape — will they be okay?
- A single grape is a low dose for most dogs and many will be fine, but because the reaction is unpredictable there's no guarantee. Call a pet poison line for advice — for a small dog, or if your dog ate raisins rather than a fresh grape, they may still recommend making your dog vomit to be safe.
- What are the symptoms of grape poisoning in dogs?
- Vomiting is usually first, often within a few hours and sometimes with bits of grape or raisin in it. Then diarrhea, lethargy, loss of appetite, belly pain, and increased or decreased thirst and urination as the kidneys are affected. Kidney failure can develop over 24–72 hours, so early treatment matters.
- What will the vet do?
- If it's recent they'll likely make your dog vomit and give activated charcoal, then start IV fluids to protect the kidneys and run blood tests to watch kidney values over 1–3 days. The sooner this starts the better the outcome — which is why calling early beats waiting for symptoms.
Sources
These are the references behind this calculator. Where a source gives a range we take the midpoint and round toward caution, and where we go beyond what a source states — an extra safety margin, or a rule of thumb rather than a clinical threshold — the page says so in the text above.
- Raisins & grapes — Pet Poison Helpline
- People foods to avoid feeding your pets — ASPCA
- Animal Poison Control Center — ASPCA