Holistic Transition offers a natural way for dog and cat owners to transition their pet to any brand of premium holistic pet food. Holistic Transition was built on the science-based benefits of Probiotics and Digestive Enzymes. During periods of pet stress, such as a change of diet, the microbial balance in the digestive tract may become upset. Probiotics (as used in Yogurt), additional friendly microbes such as B. subtilus, Aspergillus oryzae, plus Digestive Enzymes, maintain a healthy balance, so transition will be symptom-free. The type of Probiotics used in Holistic Transition occurs naturally in the pet"s digestive tract. Once the 7-day transition period is complete, the normal levels of Probiotics and Digestive Enzymes included in all Holistic Select recipes, will maintain a healthy environment in the pet"s digestive system, under normal conditions.