@tanza This study they based it on has been debunked pretty thoroughly as to how valid it is. Furthermore, serious questions have been raised about the study---including using a breed prone to taurine deficiency.
From the FDA::
The agency outlined the multiple potential factors that can, alone or in combination, contribute to dogs developing this rare and scientifically complex disease. The agency concluded that there is nothing inherently unsafe about a grain-free diet.
Dr. Steven Solomon, director of the FDA’s Center for Veterinary Medicine, acknowledged that the “complex scientific messaging” on DCM and diet has contributed to misinterpretation about the safety of a grain-free diet. Dr. Solomon encouraged dog owners to select the diet that works best for their pet’s nutritional needs and previewed more multidisciplinary, scientific collaboration between the industry, veterinarians, scientists and other researchers that will further the understanding of DCM."
(Sorry I lost the link to this:
"Here’s what we know so far about this report:
Per the FDA report, “the American Veterinary Medical Association estimates that there are 77 million pet dogs in the United States. As of April 30, 2019, the FDA has received reports about 560 dogs diagnosed with DCM suspected to be linked to diet. Tens of millions of dogs have been eating dog food without developing DCM.”
That’s 560 dogs out of 72 million. Approximately one in four dogs will get cancer every year and nearly half of all dogs over ten will die from it. Now, that’s something to be concerned about, in comparison to the 0.000007% chance of DCM. "
BUT there are studies indicating grain free may be a factor, especially in breeds with taurine deficiency issues