There's an excellent article on this in the October issue of the Whole Dog Journal that explains it's not just grain-free foods that are implicated in the DCM issue. They detail four areas of concern. Here's an excerpt, but I'd encourage everyone to read the whole article here: https://www.whole-dog-journal.com/food/diet-dogs-and-dcm/ Legumes. The FDA reported that 93% of all products involved in the reports they were investigating contained peas and/or lentils. Our analysis confirmed that 89% of the reported foods appeared to contain significant amounts of these ingredients (generally appearing before the first fat or in multiple combinations, sometimes with other legumes). Lamb. Lamb-based diets are a known risk factor for taurine-deficient DCM. Our analysis found that more than 20% of the foods named in the FDA’s reports were lamb-based. Limited-ingredient. We were a little surprised to find that limited-ingredient diets were also overrepresented in these reports and we therefore consider them another potential risk factor. Low-protein. Diets with low protein levels are a known risk factor for DCM. Normal-protein diets that rely on plant proteins, such as from legumes, also appear to pose a higher risk.