NATIONWIDE — The FDA says it’s launching an investigation after a euthanasia drug was found in cans of dog food. Washington, D.C. TV station WJLA partnered with the lab Ellipse Analytics to test multiple brands of wet dog food for the drug used to assist death in vet clinics, pentobarbital. In total, they tested 62 samples of more than two-dozen brands. One brand, Gravy Train, repeatedly came back positive for pentobarbital, according to the station. Out of the 15 cans tested, nine tested positive — or 60 percent. Gravy Train, made by Big Heart Pet Foods, is owned by Smucker’s....