Figures a and b: Right lateral radiographs of a 10.5 year old, mixed breed dog diagnosed with DCM while consuming a grain-free diet. Figure a shows marked enlargement of the heart, prompting treatment with medications to prevent congestive heart failure as well as a change in diet. Figure b shows a smaller heart 5 months after treatment. Typically, DCM can be treated with medications to reduce symptoms, but an objective reduction in heart size is not expected. There are only rare instances of “reversible” DCM (such as with low thyroid function or taurine deficiency), and current evidence shows that certain diets may be included in these reversible factors.