Adult dogs need a healthy, balanced diet of nutritional food made just for them. Whether you feed your adult dog wet or dry dog food, you can choose from a variety of brands, like Hill's Science Diet, Canidae, Merrick, Innova, and Evo, to help your dog stay healthy. You should also make sure to purchase a food that fits your dog's size. Large breeds have different health requirements than small breeds. Foods developed for a specific type of breed contain the right balance of calories and calcium to ensure proper growth and maintenance.