Both cats and dogs are at risk, and just a teaspoon amount could kill a cat. They don't even have to drink it - they can be poisoned from grooming it off their coat and paws. Where could my pet come into contact with antifreeze? Antifreeze is present in car radiator coolants, windscreen de-icing products, and sometimes in brake fluid and in paints. So garages are the most common source. You should check you car for any leaks (have a look underneath it when it's been parked).