It’s not something vets are “shuffling their feet” on. It’s something that researchers don’t care about because it’s seemingly dog specific. Most well funded studies have some monetary benefit to a large company (no problem for big 4 means they’re not going to invest in it and surprise surprise, Blue Buffalo and Wellness aren’t jumping in to save the day). Or money comes from grants for something that will benefit people. The moneys gotta come from somewhere to do research and despite all their caring, it’s sure as shit not coming from pet owners and those wonderful small all natural dog food companies. So if you want to do something to ensure there isn’t a problem with your dog then buy from the big 4 (gasp!) or make some sort of a pitch or fund to do research on it.