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:Mass extinction underway and WE ARE TO BLAME - shock UN reportNASA astroid WARNING: DART mission ‘Earth's last line of defence’Rapist and serial killer’s brain scanned – 'one in a million' find left scientists STUNNEDNASA asteroid SHOCK: Why 'NUCLEAR OPTION' may be used on Earth-bound rock – 'last resort'Greenpeace chief LASHES OUT over climate change: ‘DESTROYING our planet for FAST FOOD!'Asteroid Bennu goes TECHNICOLOUR in NASA 3D video