Been feeding salmon for years, vast majority of rural alaskans do the same. Quite expensive (triple) to ship dogfood into bush. I usually buy a pallet of national when I can get it here but mostly they eat fish. In summer, I cook it down into soup, but in winter after it has froze hard for several weeks; its fine raw. They just luv me to death when I throw them each a 2 foot chum every other day. I either split and hang from tail or often just run knife from behind head to in front of tail and run spruce pole thru. They prefer the guts & eggs with their fish.
Actually, I watch feeding caribou & moose scraps; that has to be cooked down. I think the the freezing process must have something to do with the salmon?
But the Indians have fed raw fish since time began. They use to stake their dogs along river so they would learn to catch their own salmon, or starve. They then didn't have to even think about their dogs from June until October and ended up not keeping dumb dogs. Thanks for the link.