A couple of main points about transitioning to a new food or a recently upgraded formula.

Generally speaking, dogs and cats enjoy eating new foods. Like us, they're attracted to aroma and taste. Cats particularly enjoy the mouth-feel of kibble, so size is of particular importance. After the second or third day of a new diet, some pets may find the new food less exciting, and thus eat less voraciously. Consequently, some pet parents worry that there is something wrong with the food, but it’s not about the food at all. Once they've tried a new food, they may be hoping for yet another new food, and when it doesn't come, they're let down.
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Most dogs and cats ONLY eat to meet their nutritional needs. That means that when they are not hungry, they don’t need or want food. We have all witnessed this change in appetite where our pet will eat voraciously one day and pick at the food another day. Pet parents worry when their pets don’t eat their meal and start to add things to the food or buy a new food in order to entice their pet to eat. This is not a good idea since anything new will be welcomed and eventually the dog or cat simply will not eat until there is something new and unique in the dish every meal. If your dog or cat is feeling well and refuses his food, pick it up and save it for another meal! Some dogs will go 3-4 days without eating. They simply don’t need the calories or major nutrients. A cat must not go more than two days without eating. So in summary, if your dog or cat is acting normally, remove any uneaten food and save it for the next meal time.
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If you notice any other symptoms besides a lagging appetite, such as lethargy or gastric upset, we urge to you contact your veterinarian to diagnose what's going on.