I have been educating for over 40 years that combining a raw diet with kibble is a hard combination for pets to digest. This is because the digestive time of raw and kibble is different. There is a strain on the pancreas when generating the right combination of digestive enzymes to digest 2 different diets. This often results in gastrointestinal upset (mainly diarrhea and vomiting) and in some cases, long-term depression of the digestive and/or immune system.