The recent poisoning of pets here in the US from their food seems to have been caused by melamine a man made plastic. Researchers at Cornell have found the plastic in the urine of cats and the kidney of one cat. This find is also inclusive of the find of aminopterin found in samples of the pet food responsible.
ScienceDaily: Cornell Details Effect Of Pet Food Contaminant, Melamine
More on the recall here. And here is the list of recalled pet foods.
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