🍇 My Dog Ate Grapes or Raisins. What Now?
Grapes, raisins, sultanas and currants cause acute kidney injury in dogs, and after twenty years of study nobody can tell you a safe number: some dogs eat a bunch and are fine, some die after a handful. The 2021 finding that tartaric acid is the culprit explains why (grape varieties differ wildly in it). So the rule is blunt: any ingestion is a phone call, and more than one grape or raisin per 4.5 kg is an emergency.
Grapes and raisins dose checker
Your dog's weight plus what went in gives the dose per kilo and the urgency. Estimating? Assume the worst case.
How much is toxic?
Nobody knows exactly, and that is the honest answer. Published cases include kidney failure after 0.7 oz of grapes per kg (about 3 grapes per kg) and 0.1 oz of raisins per kg (about 3 g/kg), but also dogs eating far more with no effect. Since 2021 the leading explanation is tartaric acid, which grapes and raisins contain in amounts that vary by variety and ripeness, and which dogs cannot excrete well. Merck's current guidance sets the risk line at more than one grape or raisin per 4.5 kg (10 lb). Sultanas, currants, grape juice, wine pomace, mince pies, hot cross buns, Christmas pudding, fruit cake, trail mix and some granola all count.
Symptoms and timeline
| Time after eating | What you may see |
|---|---|
| 0 to 6 hours | Often nothing. This is the treatment window: vomiting can be induced within about 2 hours, activated charcoal after that. |
| 6 to 12 hours | Vomiting, sometimes diarrhoea; lethargy, going off food, belly tenderness. Grape or raisin pieces may appear in the vomit. |
| 24 to 72 hours | Acute kidney injury: drinking and peeing more, then less or none, weakness, bad breath, tremors. Once urine production stops, most dogs die or are euthanised. |
What the vet will do
Induce vomiting if it was recent, give activated charcoal, run baseline kidney bloodwork (creatinine, urea, phosphorus) and urinalysis, and usually admit the dog for 48 hours of intravenous fluids to flush the kidneys, repeating bloodwork at 24, 48 and 72 hours. Dogs treated before symptoms almost always do well. Dogs already in kidney failure need intensive care and sometimes dialysis, and the outlook is guarded.
What to do right now
- Take the grapes or raisins away and note the time and the count (or the size of the bag).
- Call your vet or a poison line: Pet Poison Helpline (US/CA) 855-764-7661 · ASPCA Animal Poison Control 888-426-4435 · Animal PoisonLine (UK) 01202 509000 · Ireland and elsewhere: your vet or the nearest emergency clinic. Poison lines charge a fee; they are worth it.
- Do not induce vomiting at home unless a vet tells you to and how; hydrogen peroxide has its own risks.
- Go to the clinic with the packaging. Bring a urine sample if you can.
Grapes and raisins FAQ
How many grapes can a dog eat safely?
There is no established safe number. Merck's risk line is one grape or raisin per 4.5 kg of dog, but individual dogs and grape varieties differ. Vets treat any ingestion as a call and most as a decontamination case.
My dog ate one grape. Should I worry?
Call and describe your dog's size. For a large dog, one grape is under the risk line and most vets will advise watching for 72 hours; for a toy breed, one grape can be over it. If it was within 2 hours, some vets will still make the dog vomit to be safe.
Are raisins worse than grapes?
Per piece, yes: a raisin is a dehydrated grape, so the tartaric acid is concentrated into a smaller bite and dogs eat more of them. Mince pies, hot cross buns and fruit cake are the classic Christmas and Easter emergencies.
How long after eating grapes will a dog show symptoms?
Vomiting usually within 6 to 12 hours, kidney failure over 24 to 72 hours. Absence of vomiting in the first few hours means nothing; do not wait for it.
Can a dog recover from eating grapes?
Yes, usually, if treated before the kidneys are damaged: vomiting, charcoal and 48 hours of fluids. Once anuric kidney failure sets in, survival is poor even with dialysis. Speed is the whole story.
Related
Sources: Merck Veterinary Manual, Grape, Raisin and Tamarind Toxicosis in Dogs (tartaric acid; >1 grape or raisin per 4.5 kg risk line); ASPCA Animal Poison Control Center (2021 tartaric acid findings); Pet Poison Helpline grape and raisin guidance. Thresholds are population figures for otherwise healthy adult animals; puppies, kittens, seniors and animals with kidney, liver or heart disease can be affected at lower doses. Last reviewed August 2026.