Very interesting! Venison is being recommended as a novel protein for pets with allergies or IBD, but my vet told me he has been really disappointed with results from venison pet food. So maybe the food is not even venison?
I'm having to cook my dog's duck. It is a lot of work, but if I try to used canned duck pet food, even 100% duck or just duck with vitamins, sometimes he reacts badly. So maybe some cans are not even duck.
I read about lamb pet food being adulterated with cheaper proteins a couple of years ago, but supposedly testing had improved. Hmmmm...
http://nationalrenderers.org/assets/essential_rendering_book.pdf
"Lamb Meal: Lamb meal has been a popular ingredient in dog and cat diets
for the better part of the last 15 years. Initially it was considered a novel ingredient in diets for animals with food-related allergies (hypersensitivity). Lamb meal and rice diets were some of the fastest growing products offered in the pet food aisle—
to the point that lamb meal supply was outstripped by the demand. “Lamb meal
analogs†made of other protein meals were rumored to have entered the market, but tight controls due to BSE and scrapie issues and new DNA typing technology (Krcmar and Rencova, 2003) have all but made this an issue of the past."