The pet-food industry is heavily embedded in the veterinary profession. It runs courses that give veterinary nurses qualifications in animal nutrition; it publishes textbooks on nutrition and hands them out free to veterinary students. And, as Allport explained, it doesn’t stop there.
‘In many cases, the salaries of lecturers in nutrition in veterinary colleges are paid by the pet-food companies,’ he said. ‘So most students today don’t get any information about anything other than commercial pet food.’
Preservatives make the bags and cans last longer That's convenient for the dog food company, which can leave it sitting in their warehouse for a long time. Convenient for the retailer who can leave it sitting on his shelf for a long time. Convenient for the owner who can leave it in the pantry for a long time, then pour it into his dog's bowl and leave it sitting there all day if necessary.
But what is this stuff that keeps ingredients from spoiling?
Pet food preservatives include BHA and BHT (both of which are associated with liver and kidney dysfunction, and bladder and stomach cancer) and ethoxyquin, which is manufactured as a rubber preservative by a giant chemical corporation, Monsanto. The Department of Agriculture lists it as a pesticide. OSHA lists it as a hazardous chemical. The containers are marked POISON.