I have heard about a lot of dogs making remarkable recoveries on raw food. I fed Molly mostly chicken + cottage cheese with flax oil after she quit eating the K/D.
Have you heard of Transfer Factor (bovine colostrum)? I think it made her feel better, and I'm convinced it's helping Barley. I'm under no illusions he's dying, but would like to slow the cancer down if at all possible. Right now he's eating Taste of the Wild, which is no-grain.
