TL;DR: Grape and raisin ingestion is a life-threatening emergency for cats that can cause rapid kidney failure. Seek immediate veterinary care if your cat eats any amount of these fruits, as there is no safe dose.
What is grape and raisin toxicity and how does it affect my cat?
Grape and raisin toxicity is a serious condition where ingestion of these fruits leads to acute kidney injury. While the specific toxic agent within the fruit is not yet fully identified, it is well-documented that even a small amount can be fatal to some felines. Both fresh grapes and dried raisins (including those in baked goods) pose a significant risk.
Is it an emergency if my cat eats a grape or raisin?
- Urgency Level: High. Yes, if your cat has ingested any amount of grapes or raisins, you should consider it a life-threatening emergency.
- There is no known safe dose, and the onset of kidney failure can be rapid.
- Immediate veterinary intervention is required to induce vomiting or begin supportive care before toxins are fully absorbed.
Why should I take a photo of what my cat ate for the veterinarian?
- If you are unsure of exactly what your cat ate, taking a photo of the fruit or the packaging can be incredibly helpful for your veterinarian.
- A photo helps the medical team identify the specific type of fruit and estimate the quantity consumed.
- It also allows them to check for other hidden toxins, such as xylitol or chocolate, which are often found in raisin-containing snacks.
Clinical Context (Merck Veterinary Manual)
Grape or raisin ingestion can lead to anuric renal failure in some dogs, and anecdotal reports suggest similar effects in cats and ferrets. For recent ingestions of more than 1-2 g/kg, emesis should be induced, followed by activated charcoal, particularly with large ingestions. Aggressive fluid diuresis for a minimum of 48 hours is recommended, especially if vomiting or diarrhea has spontaneously developed within 12 hours of ingestion. Renal function and fluid balance should be closely monitored during fluid administration. In oliguric patients, consider dopamine (0.5-3 mcg/kg/min, IV) and/or furosemide (2 mg/kg, IV) to stimulate urine production; however, anuric patients are unlikely to survive without peritoneal or hemodialysis, and even then, the prognosis is guarded.
Chapter: Toxicology, Nephrology
Source: The Merck Veterinary Manual, 11th Edition (Page 2968)