When it comes to your dog's nutrition requirements, it's important to keep a few things in mind: Make sure that the diet you choose fits your dog's lifestyle, health, age, and breed, and give the diet plenty of time before deciding if it's good or bad. It can take a good three months of steady eating before you start seeing benefits from any new diet. As long as you keep this in mind, there's no reason why your dog shouldn't be eating better than ever!