I changed my dogs to Nutro last year around this time with devastating effects. I quickly noticed my dogs drank far more than on their previous kibble. In fact, my older dog became a concern to the point I asked my vet for a blood test which showed he was in renal failure

As I had to change his diet, I typed in Nutro + kidney in an attempt to find out if they produced a renal diet. Horror of horror....I read story after story of kidney failure. I had all 3 dogs tested and they all showed signs of impaired kidney function.
All came off Nutro promptly and back on to Skinners. 6 weeks later a retest and my 2 younger dogs had normal results. Sadly, my 14 year old (although vastly improved results) maintained impaired function results.
I will never know whether the nutro contributed but it seems a heck of a coincidence.