Last reviewed: August 2026

Can Dogs Eat Grapes & Raisins?

No Safe
DoseToxic

No. Dogs should never eat grapes, raisins, currants, or sultanas. There is no known safe amount — even a few grapes have caused acute kidney failure in some dogs. If your dog has eaten any amount, contact a vet immediately, even if they seem fine.

Why grapes are toxic — the actual mechanism

For over 20 years vets knew grapes and raisins could cause kidney failure in dogs but didn't know why. Research published between 2022 and 2025 has narrowed this to tartaric acid, a compound found in grape flesh at 0.35–2% concentration depending on variety, ripeness, and growing conditions.

The key detail: dogs lack a kidney transporter protein called OAT4 that humans use to clear tartaric acid. Without it, the acid lingers in kidney cells, where lab studies show it disrupts mitochondrial energy production until the cells die — a process called proximal tubular necrosis. This is also why cats, which retain some OAT4 activity, react far less severely than dogs do to the same exposure.

Where the science is still uncertain: concentration varies so much between grapes that there's no reliable "safe dose." A 2024 review of over 1,100 dogs found roughly 74% showed no symptoms at all after eating grapes — but vets still can't predict in advance which dogs will be the unlucky ones, so every exposure is treated as an emergency regardless of amount.

Breed & size risk factors

Unusually for a food toxicity, this one doesn't follow predictable breed or size patterns — it's described as idiosyncratic. A Chihuahua and a Great Dane face comparable relative risk. Don't assume a larger dog is safer.

Symptoms & timeline

Time after ingestion	What to expect
6–12 hours	Vomiting, diarrhoea, lethargy, loss of appetite
12–24 hours	Abdominal pain, dehydration, weakness, tremors
24–48 hours	Kidney injury signs begin: reduced or absent urination, continued vomiting

Some dogs show no symptoms in the first 24 hours yet still develop kidney injury — this is why treatment is based on exposure, not on whether symptoms have appeared.

Hidden sources

Fresh grapes — all colours and varieties, including seedless
Raisins and sultanas — more concentrated per gram than fresh grapes
Currants (dried) — same toxin class
Grape juice, wine, grape jam or jelly
Baked goods: fruit cake, muesli, trail mix, hot cross buns, rusks
Cream of tartar and tamarind — chemically related, same treatment approach

What to do if your dog ate grapes

Don't wait for symptoms. Call a vet immediately, even if your dog seems fine.
Don't induce vomiting yourself unless a vet instructs you how — done wrong, it can cause more harm.
Note the amount and time if you can — this helps your vet assess risk.
Expect decontamination (induced vomiting, activated charcoal) and often 48 hours of IV fluids and kidney monitoring, even without symptoms yet.

🚨 Emergency contacts

South Africa: Contact your nearest 24-hour emergency vet clinic immediately, or your regular vet's after-hours line.

ASPCA Animal Poison Control (US, reference only): +1-888-426-4435 — typically charges a consultation fee for non-US callers.

Sources

Wegenast et al., "Acute kidney injury in dogs following ingestion of cream of tartar and tamarinds," JVECC, 2022.
Coyne & Landry, "Tartaric acid induces toxicity in Madin-Darby canine kidney cells," JVECC, 2023.
Downs et al., "Scoping review of Vitis vinifera toxicity in dogs," Veterinary Record, 2024.
Merck Veterinary Manual, "Grape, Raisin, and Tamarind Toxicosis in Dogs," 2024.

This page is general educational information, not a substitute for veterinary advice. If your dog has ingested grapes or raisins, contact a veterinarian immediately.