I'mCustomerand I would be glad to help with your question. Aluminum foil is not toxic to cats if ingested but you are correct that it does pose a large risk for causing gastritis, enteritis and possibly causes a gastric foreign body or small intestinal obstruction. Unfortunately, I cannot find any scholarly articles or case studies on the subject. I did find a number of websites from reliable sources such as Tufts and one veterinary text reference from Clinical Medicine of the Dog and Cat, Second Edition that mention the risk:
Here are other websites that mention risks of aluminum foil to cats and dogs:
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