Gustav said:
I think some vets practices must have a commision deal with the food companies (please correct me if i'm wrong!!), and of course owners thinking that their vet must be selling it because it's in your pets best interest!
yup, exactly. according to an article int he wall street journal some time ago, pets selling science diet for example pocket profits of up to 40% of the amount they sell a bag for.
in addition to that, most of the research and education on pet nutrition is sponsored and provided by the pet food industry giants, which of course will not allow any results being published that show their products in an unfavorable light.
as an example, have a look at the
entry page for the "veterinary nutrition program" part of the
american college of veterinary nutrition to see who is a major sponsor.
other major names in the field are hill's (science diet/prescription diet), waltham (now owned by mars) and iams/eukanuba.
if you are interested in this topic, read tom lonsdale's book "raw meaty bones promote health" - even if you are not interested in raw feeding. this book documents the links between the pet food industry and veterinarians and their various associations. it's a true eye opener that goes even deeper into the matter than ann martin's book "food pets die for", since lonsdale is a veterinarian himself.