Grape & Raisin Toxicity Calculator for Dogs
Merck Veterinary Manual reports that more than one grape or raisin per 10 lb (4.5 kg) of body weight may pose a kidney risk, but there is no proven safe amount, so any ingestion means calling your vet now. (Merck Veterinary Manual; ASPCA APCC)
Grapes toxicity calculator
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.
Unit weights are approximate (USDA FoodData Central reference weights); real sizes vary.
Risk level (example)
Call your vet now
Estimated dose: 0.37 g/kg (approximate, for your vet)
No established safe dose — the risk level never drops below “Call your vet now”.
- Call your vet or a poison hotline now, even if your dog seems fine.
- Early decontamination and kidney monitoring are commonly advised.
- Note the product, amount and time eaten; keep the packaging.
- Do not induce vomiting unless a veterinarian tells you to.
Emergency line
ASPCA APCC (888) 426-4435, fee may apply · Pet Poison Helpline (855) 764-7661, fee may apply
How thresholds are set: Published references (ASPCA APCC, Merck, Pet Poison Helpline) report no established safe dose: kidney injury is idiosyncratic and has been reported after small amounts. The g/kg figure is shown only to share with your vet; any amount is treated as a reason to call now.
Source: ASPCA APCC — grape and raisin toxicity in dogs; Merck Veterinary Manual — grape, raisin and tamarind toxicosis in dogs
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.
Result tiers and what to do now
Call your vet now — Any grape, raisin or currant
Call your vet or a poison hotline now, even if your dog seems fine. Early decontamination and kidney monitoring are commonly advised. (ASPCA APCC)
Emergency — Vomiting, lethargy, reduced urination after eating grapes/raisins
Go to the nearest emergency vet now and call ahead. (Merck Veterinary Manual)
Call for help
Call your vet or an emergency clinic. ASPCA Animal Poison Control Center (888) 426-4435 or Pet Poison Helpline (855) 764-7661 (fees may apply). Never induce vomiting without a vet's say-so.
Dose by dog weight
| Dog weight | Grapes or raisins | Risk at any amount |
|---|---|---|
| 5 lb (2.3 kg) | more than 0.5 | Call your vet now |
| 10 lb (4.5 kg) | more than 1 | Call your vet now |
| 20 lb (9.1 kg) | more than 2 | Call your vet now |
| 40 lb (18.1 kg) | more than 4 | Call your vet now |
| 80 lb (36.3 kg) | more than 8 | Call your vet now |
Kidney injury is idiosyncratic: some dogs have been affected below this level. The table is not a safe allowance. Published ranges are not safe allowances.
Frequently asked questions
How many grapes are toxic to a dog?
Merck Veterinary Manual reports that more than one grape or raisin per 10 lb (4.5 kg) of body weight may contain enough tartaric acid to pose a kidney risk. Because reactions are unpredictable, there is no proven safe number; call your vet after any amount.
Are raisins more dangerous than grapes?
Raisins are dried grapes, so the same weight of raisins holds far more fruit. The calculator uses about 0.5 g per raisin and 5 g per grape; sizes vary.
My dog ate one grape and seems fine. Should I still call?
Yes. Published references (ASPCA APCC, Merck, Pet Poison Helpline) advise calling a veterinarian after any ingestion, because kidney injury signs can be delayed 24–72 hours.
Should I make my dog vomit?
Never induce vomiting without a veterinarian's say-so. Your vet or a poison hotline can tell you whether it is appropriate and how to do it safely.
Related calculators
Sources
- Merck Veterinary Manual — grape, raisin and tamarind toxicosis in dogs
- ASPCA APCC — grape and raisin toxicity in dogs
- Pet Poison Helpline — grapes
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.