Here's the trouble, who funds studies? Primarily dog food companies, which don't stand to make any money off looking at raw diets, so unfortunately, you may no find what you're looking for.
There are vets who have seen, through their own experience, the benefits of raw and/or homemade diets (and a few who have written books), and there is a ton of anecdotal evidence, but at a certain point it comes down to taking the plunge and seeing for yourself or not.
I think it would be amazing if there was long term study of raw fed dogs, but who's going to cough up the cash?
