The pet food recall was expanded this to products made at a Canadian factory. This factory used an ingredient tainted by an industrial chemical.  The previous Menu Foods recall included cat and dog food made in New Jersey and Kansas plants - the only plants believed to have received the contaminated imported wheat gluten.

It appears now that Menu Foods found that some of the tainted wheat gluten had made it to Canada. The U.S. Food and Drug Administration discovered this and told the company that tests had detected the same dangerous chemical in plants in Streetsville, Ontario.

For more information, refer to this article on CNN