A recent pet food study published in the journal Food Control found more than a third of the commercial pet food tested displayed ingredient labels that were potentially mislabeled according to The Seattle Times.

The study was conducted by researchers from the Chapman University’s Food Science Program which used DNA testing on both cat and dog food in order to identify the meats contained within the pet food products.

The study found that 20 out of the 52 products tested were potentially mislabeled. 16 of the pet food products contained meat species that were not included on the product label and 1 product contained an unidentified non-specific meat ingredient. Pork was the most common undeclared meat.

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Chapman University – Pet Food Mislabeling Study
http://blogs.chapman.edu/press-room/2014/09/16/chapman-university-research-on-meat-species-in-pet-foods-shows-not-all-brands-follow-regulations/