(NBC News) Dogs fed “grain-free” food based on peas, lentils or potatoes are developing an unusual condition that can cause an enlarged heart, the Food and Drug Administration warned Thursday.

The condition, called canine dilated cardiomyopathy, is more common in certain breeds, but it’s turning up in breeds that are not usually susceptible, the FDA said.

The agency is not naming brands, but said the ingredients seemed to be more important than the brands. The affected dogs appear to have been fed certain types of pet foods.

Note: Read our discussion guidelines before commenting.