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http://www.doctordog.com/catbook/catpoison.html

ANTIFREEZE (ETHYLENE GLYCOL)Poisoning with antifreeze is one of the most common poisoning conditions found in cats because ethylene glycol has a sweet taste that appeals to cats and dogs. One teaspoon of antifreeze can kill an average-sized cat. Signs of toxicity, which appear suddenly, are vomiting, uncoordinated gait (seems "drunk"), weakness, stupor and coma. Death can occur in 12 to 36 hours. Convulsions are unusual. Cats that recover from the acute poisoning may have damage to their kidneys and go on to kidney failure.

Treatment: Induce vomiting on suspicion of ingestion and proceed at once to the nearest veterinary facility. Intravenous alcohol is a specific antidote. Intensive care in an animal hospital may prevent kidney complications.