Grapes and raisins are a popular, healthy snack for people, but they can be dangerous for dogs. In this article, we'll explain why grapes and raisins are toxic to dogs, how little it takes to cause harm, the warning signs to watch for, and exactly what to do if your dog eats them.
Can dogs have grapes and raisins?
No. Dogs should never eat grapes or raisins in any amount. Both are toxic to dogs and can cause kidney failure, which can be fatal if it isn't treated quickly. Pet Poison Helpline ranked grapes and raisins as the second most common dog poison of 2025, behind only chocolate. If your dog eats grapes or raisins — or you think they might have — contact your veterinarian or an emergency clinic right away. Acting fast can be the difference between a full recovery and a fatal outcome.
What types of grapes and raisins are toxic to dogs?
All of them. There is no such thing as a dog-safe grape or raisin. The toxic compound is in the fruit itself, so color, variety, and source make no difference. ASPCA Poison Control lists grapes and raisins among the foods most dangerous to dogs, with poisoning documented across every common form:
- Grapes: red, green, or black; seeded or seedless; store-bought, homegrown, or organic
- Raisins and other dried grapes: golden raisins (also called sultanas) and Zante currants
- Grape pressings: the skins and pulp left over from home winemaking
A note on currants. Most dried "currants" sold in U.S. stores are Zante currants, which are small dried grapes and just as toxic to dogs as raisins. True currants, the black, red, and white berries from Ribes bushes, are a different fruit and are not considered toxic to dogs, though a large amount may upset the stomach.
Cooking, freezing, and drying do not make grapes or raisins any safer, and no amount is considered safe. How little it takes to cause harm is hard to predict, as we explain below.
What about grape juice, jelly, and wine?
Here the picture is different, though the bottom line is the same: keep them away from your dog. According to Cornell's Riney Canine Health Center, commercially processed grape products like grape juice, jelly made from juice concentrate, grape seed oil and extract, and wine have not been associated with kidney poisoning, likely because processing removes much of the toxic compound.
That is not a green light. This processing is never complete, and fresh-pressed or homemade juice skips it altogether, so these can still carry the toxin found in fresh grapes. They also bring their own problems for dogs, from the alcohol in wine to the concentrated sugar in jelly. None of them belong in your dog's diet.
Grape juice concentrate is also worth knowing about. It is used as a "natural" or "healthy" sweetener in many fruit snacks, drinks, and "no sugar added" foods, so it is easy to feed your dog grape-derived sugar without noticing. Reading labels before you share any human food is a smart habit, since grape-derived sweeteners can turn up where you least expect them.
Are human foods that contain grapes or raisins toxic to dogs?
Yes. Raisins in particular hide in foods where you might not expect them, and the toxic compound stays present whether the fruit is raw, cooked, or baked.
Keep these food items away from your dog:
- Breakfast cereals, granola, and oatmeal mixes containing raisins
- Trail mix and fruit-and-nut blends containing raisins
- Cookies, muffins, breads, and pastries made with raisins
- Fruitcake and other holiday desserts made with raisins or dried fruit
- Chocolate-covered raisins, and grape-flavored candy or chocolate
- Grape-flavored or raisin-containing ice cream and frozen desserts
- Snack bars and "healthy" energy bars with raisins or dried-fruit blends
Even heavily baked or processed foods can hold enough raisins to harm your dog.
Why are grapes and raisins toxic to dogs?
For years, no one knew why grapes and raisins were so dangerous to dogs. Early on, researchers suspected something on the fruit, like pesticides, heavy metals, or mold. But those were never found in high enough amounts to explain the poisonings.
The answer turned out to be in the fruit itself. Tartaric acid, a natural acid found in high levels in grapes, raisins, and tamarinds (a tangy tropical fruit), is now the leading suspect. In 2022, a case series in the Journal of Veterinary Emergency and Critical Care reported that dogs developed the same kind of kidney injury after eating grapes, raisins, cream of tartar (a baking ingredient used to stabilize whipped egg whites), or tamarinds, all of which are rich in tartaric acid. Pathology studies of poisoned dogs point in the same direction: The damage shows up in the proximal tubules, the tiny structures in the kidney that filter waste from the blood, matching the type of damage tartaric acid would be expected to cause.
Newer research helps explain why dogs are so vulnerable when people are not. A 2023 follow-up study in the same journal found that tartaric acid harmed canine kidney cells but left human kidney cells unharmed. The likely reason is a transporter called OAT-4, which normally helps flush tartaric acid from the kidney. Dogs have very little of this transporter, which means tartaric acid can linger in the kidneys rather than being flushed out. The buildup can damage the kidney cells that filter waste from the bloodstream.
How many grapes or raisins are toxic to dogs?
There is no safe number of grapes or raisins for a dog. The exact amount that causes poisoning is still unknown, and dogs do not all react the same way. Some have developed kidney failure after eating only one or two grapes, while others have eaten more with no apparent harm. The size of the fruit and how much tartaric acid it contains also affect the risk.
The figures that do exist are sobering. In a retrospective study of affected dogs published in the Journal of Veterinary Internal Medicine, kidney failure occurred at doses as low as 2.8 grams of raisins or 19.6 grams of grapes per kilogram of body weight. To put that in everyday terms, the Merck Veterinary Manual notes that as little as one grape or raisin per 10 pounds of body weight may carry enough tartaric acid to pose a risk. For a 10-pound dog, that can mean a single grape.
Raisins contain especially high concentrations of tartaric acid. Drying removes the water but leaves the acid behind, so even a small handful of raisins delivers much more tartaric acid than the equivalent amount of fresh grapes.
Even so, there is no way to know in advance which dogs will be affected most severely. That is why veterinarians treat any ingestion of grapes or raisins as an emergency, no matter how little was eaten.
What are the symptoms of grape and raisin poisoning in dogs?
The signs of grape and raisin poisoning appear on two timelines, and the gap between them is part of what makes it so dangerous. The first signs are usually stomach upset, within about 6 to 12 hours of eating the fruit. The more serious signs come from the kidneys and can take 24 to 72 hours to appear. A dog may even seem to settle down after the early upset while kidney damage quietly develops underneath. Early blood tests can look normal during this window, which is why a dog that has eaten grapes or raisins needs to be seen even if it seems fine.
Early signs of grape and raisin poisoning, usually within 6 to 12 hours, include:
- Vomiting and diarrhea, often the first signs
- Lethargy and weakness
- Loss of appetite
- Abdominal pain
- Increased thirst
- Tremors or shivering
Later signs, as the kidneys begin to fail within 24 to 72 hours, are more serious:
- Reduced urination, or none at all, as the kidneys shut down
- Severe dehydration
- Ongoing vomiting or nausea
- Bad breath with an unusual, chemical smell, caused by waste building up in the blood
- Seizures or coma in the most advanced cases
How is grape and raisin poisoning diagnosed?
There is no single test that confirms grape or raisin poisoning. Instead, veterinarians rely on a dog's history of known or suspected grape or raisin exposure, early symptoms, and blood and urine tests that show how well the kidneys are functioning. One key marker is creatinine, a waste product that healthy kidneys normally remove from the bloodstream. Because those values can look normal in the first hours and a poisoned dog can worsen quickly, vets often begin treatment right away, even before the lab results change, and repeat the tests over two to three days.
"Grapes and raisins should always be treated as toxic to dogs. If your dog eats any amount, contact your vet right away."
Dr. Léa Engelman, DVM
Help! My dog has eaten grapes or raisins. What can I do?
Act quickly, and do not wait for symptoms to appear. Call your veterinarian or the nearest emergency clinic right away, or one of the animal poison control hotlines below. The sooner your dog is treated, the better the chance of a full recovery.
When you call, have a few details ready:
- Your dog's breed, age, and weight
- Roughly how many grapes or raisins your dog may have eaten, and when
- Whether the fruit was fresh, dried, or part of another food
- Your dog's existing health conditions
If your dog ate a prepared food like trail mix, cereal, a snack bar, or baked goods, keep the packaging and bring it with you to the veterinarian. The ingredient list helps the doctor estimate how much your dog actually ate.
One important caution: Do not try to make your dog vomit at home unless a veterinarian or poison control expert tells you to. Whether to induce vomiting depends on how long ago the fruit was eaten, how much was involved, your dog's condition, and any other medicines or illnesses. A professional will decide whether it is safe and likely to help, and doing it at the wrong time can make things worse.
Pet poison helplines
If you cannot reach your own veterinarian, these hotlines are staffed around the clock:
How is grape or raisin poisoning treated?
There is no antidote for grape or raisin poisoning, so treatment focuses on quickly removing the fruit, protecting the kidneys, and closely monitoring for complications. Care usually involves several steps:
- Decontamination: If your dog ate the fruit recently, the vet may induce vomiting to clear it from the stomach, sometimes followed by activated charcoal to soak up what remains. This works best in the first few hours and should only be done by a professional.
- IV fluids: Most dogs are placed on intravenous fluids, usually for at least 48 hours, to support the kidneys and keep blood flowing through them. This means a hospital stay for close monitoring.
- Blood and urine tests: The vet tracks kidney values such as creatinine and blood urea nitrogen, along with electrolytes and how concentrated the urine is, repeating the tests over several days to see whether the kidneys are holding up.
- Supportive medications: Depending on how sick your dog is, treatment may include anti-nausea drugs, pain relief, and medications that help maintain blood pressure and urine output.
In severe cases where the kidneys stop producing urine, some specialty hospitals can offer dialysis to filter the blood and give the kidneys a chance to recover.
Can a dog recover from grape and raisin poisoning?
Yes, many dogs recover, especially when they are treated early. The outlook depends on three things:
- How much was eaten: Larger amounts raise the risk, and raisins are more dangerous than grapes because they are more concentrated.
- How quickly treatment began: The sooner the grapes or raisins are cleared and the kidneys are supported, the better the outcome.
- Whether the kidneys are already damaged: This is the single biggest factor in whether a dog survives grape or raisin poisoning.
If the kidneys are not yet affected: Most dogs that eat grapes or raisins never develop kidney failure at all. In a study of 139 dogs that had eaten grapes or raisins, fewer than 7% developed kidney injury, and all but one survived. Caught early, before kidney values begin to rise, most dogs recover fully, especially when the fruit is cleared within the first couple of hours.
If kidney failure has begun: The outlook is far more serious. In an earlier study of dogs with grape-related kidney failure, only about half survived. As kidney values climb and urine output drops, the chance of recovery falls quickly. In the most severe cases, where the kidneys stop producing urine altogether, the damage is often beyond repair. This is why prompt attention matters so much, and why any exposure warrants an immediate call to your veterinarian or poison control.
"A dog can seem fine for a day or two while kidney damage is already setting in. Never wait for symptoms before you call your vet."
Dr. Léa Engelman, DVM
How can I protect my dog from grape or raisin poisoning?
Prevention is the easiest and most reliable way to keep your dog safe. Because no amount of grapes or raisins is safe, the goal is simple: make sure your dog can never get to them. A few everyday habits go a long way:
- Never share them: Grapes and raisins are never a safe treat, no matter how small the piece or how convincing the begging.
- Store them out of reach: Keep grapes, raisins, and trail mix in closed containers or high cupboards, not in a bowl on the counter or an open bag in the pantry.
- Read labels on packaged foods: Raisins hide in granola, cereal, baked goods, snack bars, and "healthy" mixes, so check the ingredients before sharing any human food with your dog.
- Be extra careful around the holidays: Fruitcake, holiday breads and cookies, and cheese or fruit platters with grapes show up far more often, and dropped or shared food is easy for a dog to grab.
- Secure the trash and compost: Discarded grapes, raisins, and fruit scraps are still toxic, so use a lidded bin your dog cannot open.
- Watch the yard: If you have a grapevine, fence it off and clean up any fallen grapes. Some dogs will even pick grapes straight off the vine, and most will happily eat fruit off the ground.
- Tell everyone who cares for your dog: Make sure family, kids, guests, dog walkers, and pet sitters know that grapes and raisins are off-limits and should never be shared.
- Teach "leave it" and "drop it": A reliable cue gives you a way to stop your dog before a dropped grape or raisin is swallowed.
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Conclusion
Grapes and raisins are toxic to dogs in every form and in any amount, and there is no reliable way to know which dogs will be hit hardest. The safest approach is the simplest one: Keep grapes, raisins, and the many foods that contain them completely out of your dog's reach.
If you ever suspect your dog has eaten grapes or raisins, do not wait for symptoms. Contact your veterinarian, the ASPCA Poison Control at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661 right away. The kidney damage can be well underway before a dog looks sick, and the earlier treatment begins, the better the outlook.
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