http://skeptvet.com/Blog/2019/03/a-detailed-evidence-based-response-to-petcos-ban-on-artificial-food-ingredients/ excerpt below, draw your own conclusions.
“Veterinarians have a responsibility to support and educate pet owners and to challenge unscientific, fear-based marketing ploys like the Petco blacklist. The movement towards dangerous “natural” practices like feeding raw diets and avoiding vaccination is a real threat to animal welfare, and it is exacerbated by companies seeking market advantage through feeding and capitalizing on misconceptions and fear”.
