Bischoff, K.
2013
Purina Companion Animal Nutrition Summit: Tackling Myths about Pet Nutrition

Although pet foods are generally safe, incidents of contamination have led to recalls. Commercial pet food and animal feed recalls accounted for <10% of the total food recalls in 2011 and 2012. Slightly more than half of those recalls were due to chemical contamination, misformulation or foreign material. The rest were due to Salmonella spp contamination.
Eleven commercial pet food recalls in the U.S. between 1996 and 2010 were caused by chemical contaminants and misformulations. As a result of these pet food recalls, there has been an increase in government oversight of commercial pet food manufacturers and human food manufacturers, greater manufacturuing vigilance, and increased awareness among veterinarians and pet owners.