Dog Raisin Toxicity Calculator

If your dog ate grapes or raisins

Call your vet or an animal poison control line right now, even if your dog ate only a little. This is one to act on fast, because grapes and raisins can cause sudden kidney failure in dogs, and there is no amount that is known to be safe. In the US you can call ASPCA Animal Poison Control on 888-426-4435, or the Pet Poison Helpline on 855-764-7661, both of which charge a consultation fee. Getting treatment started early makes a real difference to the outcome.

What this does

So your dog has eaten raisins and you are searching for how bad it is. This estimates a rough toxic amount and number of raisins for your dog's weight. Please read the caveat further down carefully, though, because grape and raisin poisoning does not behave like a clean threshold, and a number from any calculator should never be used to decide your dog is in the clear.

How to use it

1. Enter your dog's weight, and pick the unit.
2. Choose the raisin size, small, standard, or jumbo.
3. Pick the output unit, then tap Calculate.

Whatever the number comes out as, treat the section below as the real takeaway.

How it works

The calculator takes a commonly cited lowest toxic dose, roughly 2.8 grams of raisins per kilogram of body weight, and scales it to your dog's weight, then turns that into an approximate count using the raisin size you pick. So it gives you a figure to picture. But that figure should be read with real caution, because veterinary guidance is far more conservative. The Merck Veterinary Manual notes that more than one grape or raisin per 10 pounds of body weight may already be enough to risk kidney damage. So the calculator's number is best treated as a worst case reference, not a safe limit, and the truly important guidance is in the next section.

The part you must not skip

Here is what every dog owner needs to understand about grapes and raisins. There is no established safe amount. The toxic ingredient is now thought to be tartaric acid, and its level varies a lot from grape to grape depending on type and ripeness, so the same small handful can badly harm one dog and barely touch another. Around three quarters of dogs that eat grapes show no signs at all, but there is no way to know in advance which dog will be the unlucky one, and some have suffered kidney failure after only four or five grapes. Because of that unpredictability, any amount is a reason to call your vet straight away, and you must never use a calculated number to decide it is safe to wait and see. Grapes, raisins, sultanas, and currants all carry the same risk. Cats appear far less affected than dogs, but it is still best to keep these away from them too.

Questions people ask

References

1. Merck Veterinary Manual. Grape, Raisin, and Tamarind Toxicosis in Dogs. https://www.merckvetmanual.com/toxicology/food-hazards/grape-raisin-and-tamarind-vitis-spp-tamarindus-spp-toxicosis-in-dogs
2. VCA Animal Hospitals. Grape, Raisin, and Currant Poisoning in Dogs. https://vcahospitals.com/know-your-pet/grape-raisin-and-currant-poisoning-in-dogs