Grapes and raisins are often marketed as healthy snacks for humans, but they are incredibly toxic to cats and dogs. Even a small amount can be fatal.
The Mystery Toxin
Scientists still don't know exactly what substance in grapes causes the toxicity, but the effect is well documented: acute kidney failure. Raisins are even more dangerous because the toxin is more concentrated.
Signs of Poisoning
Vomiting is usually the first sign, followed by lethargy, lack of appetite, and abdominal pain. As the kidneys fail, urine production may stop completely. This is a medical emergency.
There is No Safe Amount
Because the toxic dose is unknown and seems to vary between individual animals, there is no "safe" amount of grapes to give a cat. Zero is the only safe number.
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What to Do?
Take your cat to the vet immediately if they ingest a grape or raisin. Early treatment involving decontamination and IV fluids can be lifesaving.