<below rant>
Most commercial grocery store, "big box store", feedlot store and prescription brands are full of crap, regardless if it says anything about "science", or "vet-prescribed" or "wholesome" or "healthy" etc...the pictures you see on the bags of food are NOT really what ends up getting IN the "food".
Any pretty colors are the vast majority of the time, FAKE and likely or potentially cancer-causing in the long term. Dogs and cats don't care about pretty colors or different shapes, nor do they care about the "4 food groups" or about "healthy vegetables". Given the option, wild or feral cats and dogs will go for meat-based and real, fresh food, not heavily processed stuff. Cats and dogs are biologically and digestively - particularly cats - similar/same as wolf and lion, which are carnivores.
I strongly advise folks to try and avoid anything made by Purina. The problems coming to light in the news aren't new - but they are more and more being made public by people who are tired of seeing their pets die from things like cancer, kidney and liver failure and having other quality of life issues, that while not necessarily immediately life threatening - DO lessen overall life quality and make the animal more susceptible to advanced problems. Ear, eye infections, smelly coat and breath, allergies, hip/joint, urinary problems - are not a "natural" part of having a dog or cat, but people
have come to assume so. These are issues caused by an imbalanced and weakened or ill immune system that may be able to hold itself together while the animal is young <or by virtue of luck of genetics> but as these things go on, the body has less and less ability to tolerate the problems.