I am a veterinarian with an interest in nutrition. While it is true that the vast majority of the brands are virtual brands who have another manufacturer makin

I am a veterinarian with an interest in nutrition. While it is true that the vast majority of the brands are virtual brands who have another manufacturer making their food, it is not true for the three brands you have mentioned whose owners sell most of the food sold. Purina (Nestle), Iams (Mars) and Royal Canin (Mars) manufacture their own food, as does Hill's (Colgate-Palmolive) and Pedigree (Mars). Mars, Nestle and Colgate-Palmolive represent over 80% of the market share in pet food. [1] [1] http://www.slideshare.net/Euromonitor/state-of-the-pet-care-market-in-2015 http://www.slideshare.net/Euromonitor/state-of-the-pet-care-...