Dog Health
Grape & Raisin Poisoning in Dogs: Toxicity, Symptoms & What to Do
Published Last updated 3 min read
Quick answer
Grapes, raisins, currants, and sultanas can cause acute kidney failure in dogs. There is no safe amount — sensitivity varies unpredictably between dogs. If your dog ate grapes or raisins, contact your vet or a poison helpline immediately, even if they seem well.
Why grapes are toxic to dogs
The exact toxic compound in grapes and raisins remains unidentified, but the effect on dogs is well documented: acute renal failure — sudden loss of kidney function.
Sensitivity is highly individual. One dog may develop life-threatening kidney injury from a single grape, while another appears unaffected — but this unpredictability means every ingestion must be treated seriously.
Affected products include fresh grapes, raisins, sultanas, currants, and foods made with them — trail mix, granola bars, fruit cake, mince pies, and some breads.
Symptoms of grape and raisin toxicosis
Early signs typically appear within 6–24 hours:
- Vomiting — often within the first few hours
- Diarrhoea
- Loss of appetite
- Lethargy and weakness
- Abdominal pain
As kidney damage progresses:
- Reduced or absent urination
- Increased thirst initially, then decreased drinking
- Bad breath from urea buildup
- Tremors or seizures in severe cases
Some dogs vomit once and seem fine, then develop kidney failure later. Never assume an absence of early symptoms means safety.
What to do if your dog ate grapes or raisins
- Call your vet or pet poison helpline immediately
- Report the type (grape, raisin, currant), approximate number or weight, time eaten, and your dog's weight
- Do not wait for symptoms
- Do not induce vomiting unless your vet instructs you
Veterinary treatment may include:
- Induced vomiting and activated charcoal if ingestion was recent
- IV fluid diuresis for 48–72 hours to protect kidneys
- Blood and urine monitoring of kidney values (creatinine, BUN, phosphorus)
- Anti-nausea medication and supportive care
Hospitalisation is standard for confirmed or suspected ingestion.
Prognosis
Outcomes depend on the amount eaten, how quickly treatment starts, and individual sensitivity. Dogs treated before kidney values rise generally recover well. Established kidney failure requires intensive care and may not be reversible.
Prevention
- Never feed grapes, raisins, or foods containing them as treats
- Keep fruit bowls, lunch boxes, and baking ingredients out of reach
- Warn children and guests — raisins in cereal and baked goods are easy to drop
- Check ingredient lists on commercial treats and breads
- Be especially vigilant during holidays when fruit cake and mince pies are common
Grapes and raisins belong on the same emergency list as chocolate and xylitol for dog owners.
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-24).
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Frequently Asked Questions
- How many grapes are toxic to dogs?
- There is no established safe dose. Some dogs develop kidney failure after a single grape; others eat several without obvious harm. Never assume your dog will be fine — treat any ingestion as potentially toxic.
- What are symptoms of grape poisoning in dogs?
- Vomiting within hours is often the first sign, followed by diarrhoea, loss of appetite, lethargy, and reduced urination as kidney damage develops. Signs may appear within 24 hours.
- Are raisins more toxic than grapes?
- Raisins are concentrated grapes and are considered at least equally toxic. Foods containing raisins — trail mix, mince pies, cereal — pose the same kidney failure risk.
- Can dogs recover from grape poisoning?
- Early decontamination and aggressive IV fluid therapy improve outcomes. Delayed treatment after kidney damage has occurred carries a poorer prognosis.