Seeing as nothing that has been said here is false......
how can it be slander? All that has been said is that there is corn, grains, etc in the food. Not a terrific diet for carnivors.
I really don't see anyone slandering their vets either. All we are saying is that vets tend to believe what they are told by the pet food company. They don't do their own research.
Last year I had a kitten suffering from the runs badly. I was worried about whether or not he was going to make it. He was the runt of the litter. My vet, whom I love, recommended a human med that was supposed to help. Thanks to information I found on this site I knew the meds he was saying to use was no longer safe for pets because of an ingredient change. My vet did not know. He had been telling people to use that for years. I took him in a printout of a few different articles I found on line and he thanked me for it!
Vets are not infallible!