My dog seemed to be depressed while she is normally very active, but as soon as I changed her food, she bounced back. Luckily she is a mixed breed because if she was a sensitive breed, I don't know what she could have suffered. She also had black stools.

My dog, 20 days after purchasing the food, started having health problems and 4 weeks later, DIED from kidney failure. Number one prohibited food for dogs, related to kidney problems, is grapes and raisins. To my surprise, now I notice (very late, even though I didn't know) that these kibbles contain 2.5% ground grape seeds. The conclusions are yours.