Possible Link Between Grain-Free Dog Food and Heart Disease, F.D.A. Says The number of dogs on the popular diets who have developed enlarged hearts is small but concerning. Researchers are beginning to investigate causes. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:When Will Electric Cars Go Mainstream? It May Be Sooner Than You ThinkStudying Sharks, Up Close and PersonalIn the Deep, Dark Sea, Corals Create Their Own SunshineMars in pictures: NASA shares stunning images of the red planetRooftop Solar Dims Under Pressure From Utility LobbyistsAre these ancient rock drawing PROOF that aliens visited Earth?