But it seems like raw fed dobes are slightly less likely to get DCM and more likely to live into an older age. Wouldn't their diet be grain free? Wouldn't they lack taurine? I don't know this for a fact but doesn't it seem raw fed dobes get DCM less and live longer doesn't it?
I don't think there is any significant evidence that raw fed Dobes actually do live longer and have a reduced likelihood of having DCM (or any other cardio issues as far as that goes.
I've seen occasional claims that this is the case but none were related to an actual study and were relying on anecdotal evidence to prove that raw feeding reduced likelihood of DCM and increased the probability that dogs (of any breed) lived longer.
I suppose that a dog fed exclusively raw (meat is assumed) would be on a grain free diet but I guess I just don't understand your point here. "Wouldn't they lack taurine?" Because they are fed raw? Or because it's grain free? Or?
Since dogs normally synthesize taurine I don't think it would make any difference if they were fed raw, or grain free or kibble.
There are some breeds that have been shown to have individual members of the breed that do NOT synthesize taurine. Those dogs should be on a taurine supplement (and they can be lab tested to see if they lack taurine) I know the American Cocker Spaniel folk have found that it shows up in their breed. And Boxers are another breed that has significant number of individual dogs who are taurine deficient.
I really don't think there is any convincing evidence that raw fed Dobes live longer or have a lower incidence of DCM than dogs fed some other way.
Just looking at my own Dobes from the first who was whelped in 1959 to my old boy who was whelped in 2005--all of them have been kibble dogs who get a variety of additional things but certainly wouldn't be considered "raw fed" dogs. And all but one dog have lived into the 9+ range (the exception was a dog with a kidney infection issue that we could not find an antibiotic that cured or controlled--he was euthanized at 7) and a couple of them have been LC dogs.
Maybe this is just luck on my part but I don't think I'd be offering it as proof that kibble fed dogs liver longer and have less DCM than raw fed dogs--I also know of raw fed dogs that lived long lives and weren't DCM dogs. I just don't think there is any conclusive evidence one way or the other.