Hi Vivien,
Perhaps you would like to rephrase your questions. So far, I get that you are asking about dog nutrition. That's about all I understood from your posts.
If that's what you'd like to know, here is some info on raw feeding:
http://en.wikipedia.org/wiki/Raw_feeding
http://drianbillinghurst.com/
If you can read English, here's a link to an e-book (pdf) on Canine Nutrition:
http://home.att.net/~wdcusick/main.html
As for subjectivity of tastes, yes, perhaps. But dogs are not humans, they don't have a preference. They just have what you conditioned them to eat.
Also, be careful of anthropocentrism (assuming that the animal see things from a human viewpoint).