I'm interested in knowing how did you introduce your dog to raw? Most dogs have sensitive stomachs. When introducing a different meal it is vital that you start slowly. If not they may get an upset stomach. It's not because it was raw. Most likely because how it was introduced. You start be mixing what they normally eat with a small portion of new food. Maybe after a couple days of doing this a little of the regular and more of the new. Continue this pattern until all the food is new. Then you can see how the dog responds to the food. You add variety one at a time following the same schedule. You can tell which food the dog was good with or allergic to.