Do I rarely see pork and only occaisionally chicken in dog food because manufacturors can give the worst of it to humans, which they'd get more money for?
I have heard recently that dogs have trouble digesting pork...yet when I googled this,there were various opinions both pro and con. I think as far as dog food goes-there is little waste in pork-so not enough for petfood manufacturers to use.
I think the reason you don't often see white meat (pork,chicken,turkey) in dog food is because dogs need the nutrition from red meat such as beef and lamb. I have only ever fed a dog white meat when they need a bland diet. My vet once advised me to feed a puppy I had on boiled white rice, chicken and egg yolk until his dodgy tummy problem cleared up.
My dogs only eat raw meat, lamb,chicken, pork, beef, meat and bones, you name it they will eat it, remember that even the modern day dog in all its shapes and forms, still has the identical digestive system as a wolf, just differing in size, I'm sure a wolf would eat a pig, no worries!