I'm putting this here so I can find it again when I need it.
And you know I just have to say....I told you so, lol. From the very beginning. ;)
While further research is needed, a literature review of 150 studies indicates dilated cardiomyopathy is inherited in dogs:
"Dilated cardiomyopathy (DCM) in dogs is largely an inherited disease and not the result of a grain-free or legume-rich diet.
This is according to a literature review of 150 studies on the causes of DCM conducted by a group of veterinarians, veterinary cardiologists, and animal nutritionists from BSM Partners published in the Journal of Animal Science (JAS). BSM is a pet care research and consulting firm that works with numerous pet food companies.
According to the authors, the analysis found no definitive relationship between grain-free and legume-rich diets and incidents of DCM. Further, they say the U.S. Food and Drug Administration’s (FDA’s) reported cases of DCM include incomplete information (e.g. no mention of a dog’s diet history, age, etc.), making it impossible to draw any sound conclusions from this data.
“We wanted to gain the best understanding of this issue, so we examined the results of more than 150 studies, which taken together, did not support a link between grain-free and legume-rich diets and DCM,” says Sydney McCauley, PhD, an animal nutritionist and the review’s lead author. “What the science does make clear is DCM is largely an inherited disease.”