Grape & Raisin Poisoning in Dogs

The exact toxic compound in grapes and raisins remains unidentified. The effect 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; another appears unaffected. That unpredictability is why every ingestion is treated as potentially toxic. There is no “they only had two, so wait and see” band that UK poison advice supports.

For the short yes/no query, see can dogs eat grapes?. This page is what happens next and what the clinic may do.

Affected products include fresh grapes, raisins, sultanas, currants, and foods made with them — trail mix, granola, fruit cake, mince pies, hot cross buns, and some breads.

Use our grape & raisin calculator only as a rough prompt — then phone your vet.

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 at first, then drinking less
• Bad breath from urea buildup
• Tremors or seizures in severe cases

Some dogs vomit once and seem fine, then develop kidney failure later. Absence of early symptoms is not safety.

1. Call your vet or Animal PoisonLine (01202 509000) immediately
2. Report type (grape, raisin, currant), approximate number or weight, time, and dog's weight
3. Do not wait for symptoms
4. Do not induce vomiting unless your vet instructs you
5. Take packaging or a photo of the food

Veterinary treatment may include induced vomiting and activated charcoal if recent, IV fluid diuresis for 48–72 hours, blood and urine monitoring of kidney values, and anti-nausea care. Hospitalisation is standard for confirmed or suspected ingestion. Out of hours: out-of-hours vets.

Kidney values (urea, creatinine, phosphate) can still be normal on the first blood sample and rise later. That is why vets often keep dogs on fluids and repeat bloods rather than sending them home after one vomit. A dog that ate raisins at lunch and wags at teatime is still in the window where damage starts.

Currants, sultanas and raisin cereal are the same family. Blueberries are not grapes — do not confuse them — but if you are unsure what the fruit was, phone anyway. Wine and grape juice are not “dilute so it is fine”; they are still grape products.

If two dogs shared a mince pie, both need advice. The calculator helps you describe amount per dog; it does not split risk fairly.

Outcomes depend on amount, speed of treatment, and individual sensitivity. Dogs treated before kidney values rise generally recover well. Established kidney failure needs intensive care and may not be reversible. “How many grapes will kill a dog?” has no honest number — that is the whole point of treating every ingestion as urgent. If the clinic recommends 48 hours of fluids, that is prevention of kidney failure, not over-caution.

Keep grapes, raisins and foods that contain them out of reach — especially around Christmas and packed lunches. Teach children not to share fruit snacks. Chocolate is a different poison with a known compound (theobromine) — chocolate poisoning — but the action is the same: phone, do not wait. If you cannot estimate the number of grapes, say “unknown amount” — that is still enough for a vet to treat as toxic. Keep the dog calm and away from more food until you have been told what to do. Do not add charcoal from a fish-tank or human tablet unless a vet directs you.