Why would we? Raw meat has no carcinogens and as long as the proper balance of bone, organ meat and muscle meat are present there is no issue. Hide, hair and feathers have no nutritional value (unless one buys the argument put forth by Royal Canin which is now advocating the “nutritional value” of “feather meal”.)
Hide/hair and feathers have virtually nothing to do with nutrition.
They are, instead, what *nature* uses to move all the bone shards and splinters out of a dog with no harm.
*Whole* raw food is what ‘wild dogs’ eat and deviating from that is unwise in the extreme.
The new raw fad is extremely dangerous.
I know a lot of people who stopped raw only after massive surgery bills and/or dead dogs.