The investigation into a possible link between some ingredients in grain-free pet foods and atypical cases of canine dilated cardiomyopathy (DCM), announced by the U.S. Food and Drug Administration (FDA) in July 2018, has caused no small amount of concern for pet food companies, pet owners, veterinarians and retailers. One of the main reasons, and a continuing source of confusion and frustration, is that so little is still known about why these cases of DCM have occurred and what role, if any, the foods the dogs were eating played. Perhaps the title of a new research paper coming out in the March 2019 issue of the Journal of Animal Science best sums up the situation: “The association between pulse ingredients and canine dilated cardiomyopathy: addressing the knowledge gaps before establishing causation.”