We do strongly recommend that you continue to feed your puppy Pro Plan Puppy. If you choose to change brands, please do NOT do so during the transitional period (first 10 days). We would like it if you fed the puppy the way we fed him/her at the club. Your puppy needs to have protein for proper development, make sure that if you choose to change brands DO NOT feed a vegetarian food. Start with 75% Pro Plan with 25% new food for 3 days. Next, 50% Pro Plan with 50% new food for 3 days. Next, 25% Pro Plan with 75% new food for 3 days. We also recommend placing your puppy on a prebiotic during the change in food, because oftentimes a change in diet can affect their little bellies.