Highly processed diet ( kibble) vs raw diet affects the stomach acidity and it's ability to cope with items which it is not used to.....more pronounced in some dogs.
It takes 7-10 days after changing to a raw diet for the PH level to drop to 2 which is the preferred level of gastric acidity.
Feeding kibble tends to not maintain a PH level of 2. Raw meat acclimates the digestive system of a dog to it's natural level ( PH 2 ) and in doing so, allows the dog to best digest bones.
And I agree with myboy diesel....do some research.