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Last medically reviewed: 2026-05-21
Are Grapes and Raisins Toxic to Cats?
Grapes and raisins are toxic to cats and can cause acute kidney failure. Even small amounts are dangerous. The exact toxic principle remains unidentified but ingestion requires immediate veterinary attention. If you suspect your cats has ingested grapes and raisins, contact your veterinarian or nearest emergency vet clinic immediately.
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| Toxic? | Severity | Time to Onset | Commonness | Urgency |
|---|---|---|---|---|
| Yes | Severe | 6–24 hours | Uncommon | Immediate |
The Toxic Principle
The dangerous compound in Grapes and Raisins is Unknown (suspected tartaric acid or mycotoxin).
The exact toxic principle in grapes and raisins has not been definitively identified. Recent research suggests tartaric acid may be the culprit. Cats appear less susceptible than dogs but kidney failure has been documented. As little as 0.05 oz per pound of body weight can be toxic.
How Much Is Dangerous?
The risk depends on your cats's weight and the amount ingested.
| Pet Weight | Dangerous Amount | Expected Severity |
|---|---|---|
| Small cat (under 8 lbs / 3.6 kg) | 1–2 grapes or a few raisins | Severe |
| Medium cat (8–12 lbs / 3.6–5.4 kg) | 2–4 grapes or small handful of raisins | Severe |
| Large cat (12+ lbs / 5.4+ kg) | 4+ grapes | Moderate |
Symptoms to Watch For
Symptoms of grapes and raisins poisoning in catss typically progress through these stages:
Early Signs
2–6 hours- Vomiting
- Lethargy
- Diarrhea
- Abdominal pain
- Drooling
Kidney Damage
12–48 hours- Decreased urination
- Increased thirst initially, then none
- Bad breath (uremic odor)
- Weakness
- Dehydration
Kidney Failure
48+ hours- No urination at all
- Seizures
- Coma
- Death if untreated
Don't Let This Happen to Your Cats
You just read what grapes and raisins does to catss. The symptoms. The suffering. The $400–$4,000 vet bill. The question is: are you prepared if it happens again?
Get the Emergency Kit — Be Ready →What to Do Right Now
- 1 Call your vet immediately — do not wait for symptoms.
- 2 If ingestion was within the last 2 hours and your cat is alert, your vet may advise inducing vomiting with 3% hydrogen peroxide (1 tsp per 5 lbs body weight, max 3 tsp).
- 3 Do NOT induce vomiting if your cat is already vomiting, lethargic, or having seizures.
- 4 Collect any remaining grapes or raisins and bring them to the vet.
- 5 Take your cat to the emergency vet immediately for IV fluids and blood work to check kidney values (BUN and creatinine).
- 6 Do not give any human food, milk, or home remedies.
Treatment and Recovery
Your vet will induce vomiting if ingestion was recent, then administer activated charcoal to bind remaining toxins. Blood work will check BUN, creatinine, and phosphorus levels to assess kidney function. IV fluid therapy (diuresis) is the primary treatment, typically running for 48–72 hours to flush the kidneys. Urine output is monitored closely. Anti-nausea medications (maropitant, ondansetron) and gastrointestinal protectants (famotidine, sucralfate) are administered. In severe cases, dialysis may be needed.
Estimated Cost
$400 – $4,000
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Frequently Asked Questions
How many grapes are toxic to a cat?
There is no established safe amount. Even a single grape or a few raisins can potentially cause kidney damage. All ingestions should be treated as emergencies regardless of the amount consumed.
What if my cat only licked a grape?
A lick is unlikely to cause toxicity as the dangerous dose requires ingestion. Monitor for vomiting or lethargy over the next 24 hours and call your vet if any symptoms develop.
Are seedless grapes safer than grapes with seeds?
No. Both seedless and seeded grapes, as well as all varieties (green, red, black), are equally toxic. Raisins are actually more concentrated and therefore more dangerous per ounce.
Can cats eat grape juice?
No. Grape juice contains the same toxic principle and should be kept away from cats. Even small amounts can be harmful.
How long after eating grapes will a cat show symptoms?
Vomiting and lethargy may appear within 2–6 hours. Kidney damage typically shows in blood work within 12–48 hours. This is why immediate veterinary care is critical even before symptoms appear.
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Medical Disclaimer: The information on this page is for educational purposes only and is not a substitute for professional veterinary advice. If you suspect your pet has been poisoned, contact your veterinarian or nearest emergency vet clinic immediately. This page was last reviewed on 2026-05-21.
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