Most pets can handle changes in their diet easily and without issues, providing foods are high-quality.  If your pet is not accustomed to variety or has a sensitive system, you’ll want to introduce new foods gradually over a period of a few days or weeks.  Whether raw, home-prepared, “people food”, canned or kibble, you can start by feeding small amounts, even as treats, for the first few days, and then begin mixing the new food into the regular diet.  For particularly sensitive pets, start with a 10% mixture and slowly increase this amount until your pet is eating the new food exclusively.  Natural enzyme supplements like OptaGest and Prozyme can help the transition by allowing your pet to digest and assimilate the nutrients, easier and by maintaining a healthy digestive tract.