How to switch your cat’s food
Regardless of the reason for the switch, it’s best to take your time when transitioning your cat from one food to the next.
Cats have sensitive stomachs and may become ill or stop eating if their food is changed abruptly. This can happen when a new food alters the intestinal environment, which may lead to diarrhea, vomiting and a refusal to eat—that’s why it’s best to gradually wean your cat off the current food and onto the new one.
Try using the “1/4 every 4 days” rule: Add 25% new food every four days until your cat is completely transitioned to the new diet. So feed your cat 75% current food and 25% new food for the first four days, 50% current food and 50% new food for the next four days, 25% “old” food and 75% new for the following four days—and then your cat can be fully transitioned to the new food!