My Dog Ate Grapes or Raisins — What to Do
If your dog has eaten any grapes, raisins, sultanas, or currants — including grape juice, wine, or any product containing these — contact your vet immediately. Grape and raisin toxicity can cause acute kidney failure in dogs, and unlike most toxins, there is no established safe dose. Even a single grape has caused kidney failure in some dogs. Every minute matters.
Why Grapes and Raisins Are So Dangerous
Grapes and dried grape products (raisins, sultanas, currants) can cause acute kidney failure in dogs. The toxic compound responsible has not been definitively identified despite decades of research. This is part of what makes grape toxicity so alarming — because the mechanism is unknown, there is no way to establish a safe threshold, and the severity of reaction varies unpredictably between individual dogs. Some dogs have eaten large quantities without apparent effect; others have developed severe kidney failure after consuming a very small amount.
Dried fruits (raisins, sultanas, currants) are significantly more dangerous than fresh grapes because the toxic compound is concentrated during the drying process. Foods containing these include Christmas cake, Christmas pudding, mince pies, hot cross buns, fruit cake, stollen, and many biscuit varieties — all common household items that dogs may access opportunistically.
What to Do Right Now
1. Contact your vet or emergency vet immediately — do not wait for symptoms. 2. Call the Animal Poison Line (01202 509 000, charges apply) if your vet is unavailable. 3. Have ready: your dog's weight in kg, the approximate number of grapes or grams of raisins eaten, and the time of ingestion. 4. If ingestion was very recent (within the last 1–2 hours) and your dog is otherwise well, your vet may recommend inducing vomiting — do not attempt this at home without explicit vet guidance. 5. Do not 'wait and see' — kidney damage occurs before symptoms are obvious, and treatment is most effective when started before symptoms appear.
Symptoms of Grape and Raisin Toxicity
Early signs (0–6 hours): vomiting — this is the most consistent early sign and typically appears within a few hours of ingestion. Lethargy, diarrhoea, and abdominal discomfort may also occur.
Kidney failure signs (12–48 hours): reduced or absent urination (oliguria or anuria — very serious signs indicating the kidneys have been severely affected); increased thirst initially, then reduced drinking; loss of appetite; vomiting continuing; weakness; dehydration (skin remains 'tented' when gently pinched); neurological signs in severe cases.
Any sign of reduced urination following known or suspected grape or raisin ingestion requires immediate emergency veterinary care.
Treatment and Prognosis
Treatment depends on how quickly after ingestion the dog is seen. For very recent ingestion, inducing vomiting followed by activated charcoal limits further absorption. Aggressive intravenous fluid therapy is the cornerstone of treatment — high fluid rates help flush the toxin through the kidneys and maintain kidney perfusion. Blood tests (creatinine, BUN, electrolytes) monitor kidney function over 48–72 hours.
Prognosis is significantly better when treatment is started within the first few hours. Dogs that develop anuric renal failure (no urine output) have a more guarded prognosis. Those treated promptly before significant kidney damage occurs often recover fully. This is a toxicity where rapid action makes a genuine difference to outcomes.