My dog ate grapes or raisins. What now?
Do this first
- Call a vet or poison control now. Do not wait to see whether symptoms appear.
- Note roughly how many, and what time.
- Do not make your dog vomit unless you are told to.
- Bring the packaging if there is any.
There is no known safe amount
This is the part that surprises people. With most toxic foods there is a dose below which you can reasonably relax. With grapes and raisins there is not.
Dogs have developed acute kidney failure after eating a single grape. Others have eaten a whole punnet with no apparent effect. The susceptibility appears to be individual, and there is currently no way to know in advance which kind of dog you have.
Current thinking points to tartaric acid as the likely culprit, which dogs are poorly equipped to process. That also explains why other tartaric-acid foods, such as cream of tartar and tamarind, are now treated with the same caution.
Drying removes the water but keeps the toxic component, so raisins, sultanas and currants carry more risk per gram. That includes the ones inside fruit cake, scones, trail mix and cereal bars.
Why waiting is the mistake
Kidney injury begins before a dog looks unwell. By the time vomiting and lethargy appear, damage may already be underway, and treatment becomes much harder and much more expensive.
Decontamination within the first few hours is by far the most effective intervention available. That window is the whole reason to call immediately rather than watching and waiting.
Symptoms, and the timeline
| When | What you might see |
|---|---|
| 0 to 6 hours | Often nothing. Sometimes vomiting, and pieces of grape or raisin in it. |
| 6 to 24 hours | Lethargy, reduced appetite, diarrhoea, abdominal discomfort. |
| 24 to 72 hours | Reduced or absent urination — the sign that kidney function is failing. Bad breath, mouth ulcers. |
What the vet will do
Expect induced vomiting if the ingestion was recent, activated charcoal, and then intravenous fluids for 48 to 72 hours to support the kidneys and encourage urine production. They will run bloodwork to check kidney values on arrival and repeat it over the following days.
Prognosis is good for dogs treated before kidney values rise, and considerably worse once a dog has stopped producing urine.
Common questions
My dog ate one grape. Is that really a problem?
It is worth a call. Cases of kidney failure from a single grape are documented. Poison control may advise monitoring rather than a visit depending on your dog is size, but that is a decision for them to make with the details.
What about grape juice, wine or jelly?
Treat them with the same caution and call. The toxic component is in the fruit itself, and alcohol adds a separate problem on top.
Are seedless grapes safer?
No. The seeds are not the issue, and seedless varieties are treated identically.
My dog ate raisins weeks ago and was fine. Does that mean he is not susceptible?
Not reliably enough to bet on. Treat every exposure as if it is the first.
This page is general information, not veterinary advice for your individual dog. Thresholds are from the Merck Veterinary Manual and the ASPCA. If your dog is unwell, call one of the numbers above rather than reading on.