Grain-free dog food used to be a relative rarity ... an opportunity to exercise a person’s own food anxieties: You may crave white bread or soda made with corn syrup, but it’s relatively ...

Retrievers rarely get canine dilated cardiomyopathy, but it has been seen in some dogs fed 'grain-free' dog food based on legumes and potatoes. (Erik De Castro/Reuters) Unusual cases of ...