Bunches of purple grapes hanging from vines in a vineyard, the fruit that is toxic to dogs
on October 01, 2026

Can Dogs Eat Grapes? Why Grapes, Raisins, Sultanas and Currants Are Toxic

No, dogs cannot eat grapes, raisins, sultanas or currants safely. All four are toxic to dogs and are linked to sudden, acute kidney injury - even in small amounts, and regardless of a dog's size or breed. There is no known "safe amount." If your dog has eaten any amount of grapes or raisins, contact your vet immediately rather than waiting to see if symptoms appear.

Written by Jamie Sinclair, who writes about canine health, nutrition, and everyday care for Doggy Dailies - focused on translating veterinary research and real ingredient science into practical, honest guidance UK dog owners can use.
Last updated: 1 October 2026

Table of Contents

Why Are Grapes and Raisins Toxic to Dogs?

Vets have known for decades that grapes and raisins can cause acute kidney failure in dogs. For a long time, the exact cause was a genuine mystery. That changed with research pointing to tartaric acid as the likely culprit.

A 2022 study in the Journal of Veterinary Emergency and Critical Care found that cream of tartar and tamarinds - both very high in tartaric acid - caused the same pattern of acute kidney injury in dogs as grapes and raisins (Wegenast et al., 2022). This gave vets a strong lead where previously there was none.

Dogs appear to lack the gut transporters that let other species safely process tartaric acid. In dogs, it builds up in the kidney's tubule cells and damages them directly. The UK's Veterinary Poisons Information Service (VPIS) has backed this theory while noting that further research is still needed to confirm it completely.

One detail explains a lot of owner confusion. Tartaric acid levels vary hugely between grapes, depending on the variety, ripeness and growing conditions. That's why one dog can eat a grape with no apparent problem while another becomes critically ill - it isn't that the first dog is "fine with grapes."

Grapes, Raisins, Sultanas and Currants - Is One Worse Than the Others?

All four count as the same hazard. Raisins, sultanas and currants are simply dried grapes, and drying concentrates the tartaric acid into a smaller volume. Weight for weight, dried forms are considered more dangerous than fresh grapes.

This matters in the UK, where sultanas and currants turn up constantly in baking and snack packs, often without "grape" anywhere in the name. A dog that would never be offered a grape can still end up eating a handful of sultanas from a scone or a school lunchbox.

Commercial wine and grape juice are a genuine exception. Both go through a process called detartration, which removes tartaric acid for taste and clarity - this is why they don't carry the same documented kidney-injury risk as fresh grapes, raisins, sultanas or currants.

Why There's No "Safe Amount" - And Why This Food Is Different

Most "can my dog eat this" questions end with "in moderation" or "a small amount is fine." Grapes and raisins are the exception, and it's worth being direct about why.

Toxic tartaric acid levels vary hugely between individual grapes, and individual dogs seem to vary in sensitivity too. Because of this, vets cannot give a reliable "safe" threshold.

A 2009 UK study reviewing real case outcomes found no clean relationship between the amount eaten and whether a dog went on to develop kidney failure (Sutton et al., 2009). A 2024 scoping review confirmed that a precise dose-response relationship still can't be calculated from existing case data (Downs et al., 2024).

Some older sources mention a rough figure of one grape or raisin per 4.5kg of body weight as a possible risk level. That figure isn't a safety line to rely on - it's only a rough indication of how little it can take.

A small dog and a large dog have both gone into kidney failure after eating just a few grapes. Other dogs have eaten far more with no apparent harm. This unpredictability is exactly why every exposure should be treated as a potential emergency, not weighed against a mental "amount that's probably fine."

Signs of Grape or Raisin Poisoning in Dogs

Symptoms often follow a rough timeline, though not every dog shows every sign, and some show none before kidney damage is already underway.

  • Within 6-12 hours: vomiting, diarrhoea, and loss of appetite are usually the first signs.
  • Within 24-72 hours: lethargy, abdominal pain, dehydration, increased thirst and urination, or reduced urination as the kidneys begin to fail.
  • Later signs: weakness, tremors, bad breath, and in severe cases collapse, as acute kidney injury progresses.

The absence of early symptoms does not mean a dog is in the clear. Kidney damage can be developing silently in the first 24 hours, which is the entire reason vets treat ingestion itself - not just the appearance of symptoms - as the trigger for action.

My Dog Just Ate Grapes or Raisins - What Do I Do Right Now?

Don't wait and watch. Acting within the first couple of hours gives your vet the best chance of preventing kidney damage altogether.

  1. Call your vet immediately, even outside normal hours - every practice has an emergency or out-of-hours number. Tell them what your dog ate, roughly how much, and when.
  2. If you can't reach your vet, call Animal PoisonLine on 01202 509 000. It's the UK's 24-hour emergency poisons advice line for pet owners, run by the Veterinary Poisons Information Service - there's a call charge (£35 daytime, £45 out of hours), but it gets you direct advice fast.
  3. Don't try to make your dog vomit at home. Inducing vomiting incorrectly, or with the wrong substance, can cause more harm - this needs to be done by a vet, using the right drug in the right amount.
  4. Gather the evidence if you can do it quickly - the packaging, or a rough count of what's missing - but don't delay the call to do this.
  5. Go in even if your dog seems completely normal. Early treatment before symptoms start is what gives dogs the best outcome.

How Vets Treat Grape and Raisin Poisoning

If you get your dog to the vet quickly, treatment usually starts with decontamination - inducing vomiting under veterinary supervision, sometimes followed by activated charcoal to limit further absorption.

From there, dogs are typically admitted for intravenous fluid therapy for a minimum of 48 hours. This supports the kidneys and encourages urine output while vets monitor kidney function and bloodwork closely for any signs of deterioration.

A widely cited retrospective study of 43 dogs with acute renal failure after grape or raisin ingestion found 53% survived, with 15 making a full recovery (Eubig et al., 2005).

Dogs that developed complete kidney failure had a far poorer prognosis, as did dogs with very high calcium and phosphorus levels early on. This is exactly why early veterinary treatment, before failure sets in, matters so much.

A white bowl of mixed raisins and sultanas, the dried fruit used in Christmas cake and school lunchbox snacks

UK Hazards: Christmas Cake, Mince Pies, School Lunches and More

Grapes and raisins aren't just a fruit bowl risk. In the UK, dried vine fruit hides inside dozens of everyday foods, and the festive season is the single biggest risk window of the year.

  • Christmas cake, Christmas pudding and mince pies are all loaded with raisins, sultanas and currants, often soaked in alcohol too - a genuine double hazard left within easy reach over the holidays. The same table often has chocolate Yule log and selection boxes close by, so an unattended dessert table is usually a two-toxin risk, not one.
  • Hot cross buns and fruit scones are a year-round version of the same problem, and often sit at dog height on a kitchen counter.
  • School lunchboxes commonly include small boxes of raisins or sultanas as a "healthy" snack - a dropped box or an unattended bag is a real risk for family dogs.
  • Trail mix, muesli and granola bars frequently contain currants or sultanas alongside nuts - see our guide to walnuts and dogs for another common trail-mix hazard.
  • Christmas pudding and cake off-cuts given "as a treat" by a well-meaning relative are a common cause of accidental exposure - it's worth warning visiting family explicitly over the festive period.

Keeping these foods stored well out of reach - not just "up high," but in a closed cupboard or fridge - is the most reliable prevention step, especially around Christmas.

Dog-Safe Fruit Alternatives to Grapes

If you're looking for a fruity treat that doesn't carry this risk, several fresh fruits are considered safe for dogs in sensible small amounts.

  • Blueberries - small, easy to portion, and popular as a training treat.
  • Watermelon (seedless flesh only) - hydrating and low in calories.
  • Strawberries - a seasonal favourite with many dogs, given in moderation.
  • Bananas - naturally sweet, best given in small slices due to sugar content.
  • Figs - ripe flesh only, in small amounts; the fig tree's leaves and sap are a separate toxicity risk of their own.

As always, introduce any new food gradually and watch for an upset tummy, and check with your vet first if your dog has an existing health condition.

FAQs

Can a dog survive eating grapes?

Yes, many dogs survive, especially with prompt treatment. A key study found 53% of dogs with confirmed acute kidney failure from grapes or raisins survived, and some made a full recovery (Eubig et al., 2005). Survival odds are far better when treatment starts before kidney failure develops, which is why fast veterinary contact matters more than the exact amount eaten.

How many grapes would hurt a dog?

There's no reliable safe number. Toxic tartaric acid content varies enormously between individual grapes, and dogs appear to vary in sensitivity too, so vets cannot give a "safe" quantity. Treat any amount - even a single grape or raisin - as a reason to contact your vet, rather than trying to judge whether it was "enough" to matter.

Are raisins more dangerous than grapes?

Weight for weight, yes. Raisins, sultanas and currants are dried grapes, and drying concentrates the tartaric acid into a much smaller volume. A small handful of raisins can contain the toxic load of considerably more fresh grapes.

Is grape juice or wine safe for dogs?

Commercial grape juice and wine are generally considered lower risk than fresh grapes, because the production process (detartration) removes tartaric acid. That said, they offer no benefit to a dog and alcohol brings its own separate risks, so neither should ever be given deliberately.

My dog ate a grape and seems completely fine - do I still need to call the vet?

Yes. Early kidney damage often causes no visible symptoms in the first 24 hours, so a dog "seeming fine" is not reassurance. Vets would still usually recommend a check and possibly bloodwork, since starting treatment before symptoms appear gives the best chance of preventing permanent damage.

What should I do if it happens outside normal vet hours?

Call your own vet's emergency or out-of-hours number first, since they already know your dog. If you can't reach them, Animal PoisonLine (01202 509 000) is the UK's 24-hour pet poisons advice line, run by the Veterinary Poisons Information Service, and can advise directly - note there is a call charge.

This article is for general information and isn't a substitute for veterinary advice. If your dog has eaten grapes, raisins, sultanas or currants in any amount, contact your vet or Animal PoisonLine immediately rather than waiting for symptoms.

Sources

  • Wegenast, C.A. et al. (2022). "Acute kidney injury in dogs following ingestion of cream of tartar and tamarinds and the connection to tartaric acid as the proposed toxic principle in grapes and raisins." Journal of Veterinary Emergency and Critical Care, 32(6). onlinelibrary.wiley.com
  • Eubig, P.A. et al. (2005). "Acute renal failure in dogs after the ingestion of grapes or raisins: a retrospective evaluation of 43 dogs (1992-2002)." Journal of Veterinary Internal Medicine, 19(5), 663-674. pubmed.ncbi.nlm.nih.gov
  • Sutton, N.M. et al. (2009). "Factors Influencing Outcome of Vitis vinifera Intoxication in Dogs." Veterinary Record, 164, 430. bvajournals.onlinelibrary.wiley.com
  • Downs, L. et al. (2024). "Scoping Review Exploring the Evidence Base on Vitis vinifera Toxicity in Dogs." Veterinary Record. bvajournals.onlinelibrary.wiley.com
  • Merck Veterinary Manual. "Grape, Raisin, and Tamarind (Vitis spp, Tamarindus spp) Toxicosis in Dogs." merckvetmanual.com
  • Veterinary Poisons Information Service (VPIS). "Cause of grape induced kidney injury in dogs?" vpisglobal.com
  • Animal PoisonLine (VPIS pet-owner emergency service). animalpoisonline.co.uk