While dogs are man’s best friend, they are also one of the most efficient friends we have in protecting American agriculture and natural resources from the threat of invasive pests. Last month a dog trained by U.S. Department of Agriculture's (USDA) Animal and Plant Health Inspection Service (APHIS) proved that fact when he uncovered a roasted pig head stowed in passenger baggage at Atlanta's Hartsfield-Jackson International Airport. Pork and pork products from other countries are not permitted to enter the U.S. as they could bring diseases like African swine fever and foot and mouth disease to the United States.