Article written by Dr Cait Hope, SASH Tuggerah Emergency Clinician Lead.
If your dog has eaten grapes, sultanas or raisins, it’s essential to act fast. Grapes and raisins can cause serious health issues in dogs, including acute kidney failure, even in small amounts.
In this article, we’ll cover why grapes and raisins can be toxic, how much may be dangerous, symptoms to watch for, and what steps to take if your dog has ingested them. We’ll also explain treatment options and how you can prevent accidental ingestion in the future.
Are Grapes And Raisins Toxic To Dogs?
Yes, grapes and raisins can be toxic to dogs. All members of the Vitis spp are potentially toxic. Grape toxicity is unpredictable – this means that some dogs can spend their lives eating as many grapes as they like and nothing will ever happen, and other dogs can get severe life-threatening kidney failure from eating a single grape.
For those dogs that are susceptible even small quantities can cause severe kidney injury or kidney failure, which can be life-threatening. The exact substance that causes toxicity is still unknown, but it can affect dogs of any breed, age, or size. Immediate veterinary care is crucial to minimise the risk of serious complications.
Because there is no way to know if your dog is going to react until it gets kidney failure, we recommend assuming all dogs that have ingested grapes are susceptible to being poisoned. The risk of waiting until we see signs of kidney failure is too high. Dogs are the only species in which grape toxicity has been reported in the literature.
How Many Grapes Or Raisins Are Toxic To Dogs?
The exact toxic dose of grapes is unknown, and as time goes on and more evidence emerges it would appear to be lower than previously suspected. Reports have found that four grapes can induce acute kidney injury in an 8kg dog, extrapolating that 1 grape in a 2kg dog could be toxic. Toxicity may also not be dose dependent and varies between individuals – with some dogs never experiencing signs of toxicity.
Because there is no clear “safe” amount, ingestion of any quantity should be treated as a veterinary emergency.
Can A Single Grape Kill A Dog?
Yes, it is possible, in a small dog. Although not every dog will react severely to a single grape. Given there are documented cases where very small amounts have led to acute kidney injury, and it is impossible to predict how an individual dog will react, it is safest to treat any grape ingestion seriously.
What Types Of Grapes Are Dangerous To Dogs?
All types of grapes and Vitis spp fruits are considered dangerous to dogs, including:
- Green grapes
- Red grapes
- Seedless grapes
- Homegrown grapes
- Raisins and sultanas (dried grapes)
No reports exist of toxicosis from grape juice, jelly, leaves, grape seed oil or wine, however it remains unknown whether these are toxic and we would still advise treating as toxic
Dogs should not be allowed to consume any form of grape or grape-derived products.
Steps To Take If Your Dog Eats Grapes Or Raisins
If your dog eats grapes or raisins, take immediate action:
- Contact your veterinarian or an emergency clinic immediately. Provide your vet with details about your dog’s size (weight), breed, and the estimated amount consumed. They will provide further advise.
- Do not wait for symptoms to appear — early treatment improves the chances of a good outcome. By the time symptoms develop often kidney damage can be quite severe.
- Please present to your nearest vet or emergency clinic – They will likely induce vomiting to expel any grapes from within the stomach, reducing the risk of toxicity. They will give guidance regarding the need for any possible ongoing treatment or monitoring.
Symptoms of Toxicity
Most signs of grape toxicity (i.e. kidney injury) can be delayed for 1-3 days and can be subtle at first, though sometimes dogs will vomit within a few hours.
Signs include:
- Vomiting (often within a few hours)
- Loss of appetite (anorexia)
- Lethargy or weakness
- Distended abdomen
- Abdominal pain
- Diarrhoea
- Bad breath (uraemic breath)
- Signs of kidney failure (e.g., reduced or no urination)
- Neurological abnormalities (tremors, seizures, ataxia/wobbliness) in some cases
How Long After Eating Grapes Will A Dog Become Sick?
Symptoms can sometimes appear within a few hours of ingestion but often signs are delayed 24 to 48 hours. Kidney damage, if it occurs, typically develops within 24–72 hours.
Often signs won’t occur until significant kidney damage has occurred. Early veterinary intervention can significantly improve the outcome.
Treatment of Grape And Raisin Toxicity
Veterinary treatment for recent ingestion (<2hrs) of grapes involves decontamination:
- Inducing vomiting (if appropriate and safe)
- Some vets may also recommend administering activated charcoal to limit toxin absorption
If the time for decontamination has passed treatment often involves:
- Baseline blood testing (to help track changes in kidney values that may indicate acute kidney injury)
- In some cases intravenous fluids to support kidney function
- Medications to help with nausea and appetite
- Hospitalisation for monitoring of kidney function and close and careful supportive care
- Bloodwork to assess any changes in organ function and electrolyte balance
- In some severe cases haemodialysis may be advised
The goal is to prevent toxin absorption and protect the kidneys from damage with early decontamination, then if toxicity has occurred to help support the body through the recovery.
Preventing Ingestion Is Key
Prevention is the best way to protect your dog:
- Keep grapes, raisins, and related products out of reach
- Educate family members (especially children) about the risks
- Secure trash bins and countertops where grapes or grape-containing foods might be accessible
Common Foods To Be Aware Of
Grapes and raisins can hide in many common household foods. It’s important to recognise and keep these items away from your dog.
Household Foods That Contain Grapes
- Fresh fruit salads
- Fruit platters
- Grape jelly or jam
- Grape juice
Household Foods That Contain Raisins
- Raisin bread
- Trail mix
- Oatmeal raisin cookies
- Muesli and granola
- Certain cereals
- Fruitcakes
- Some snack bars
Worried About Your Dog? Contact A Veterinarian Today
If your dog has eaten grapes, raisins, or any grape-containing foods, don’t wait — contact a veterinarian immediately. Quick action can be life-saving. Recognising early signs of toxicity and seeking urgent veterinary care gives your dog the best chance at a full recovery.
SASH is always available to help. We’re equipped to manage emergencies like grape and raisin toxicity and are here 24/7 to support you and your pet.
