Dogs always eating dog food in the middle of the night may be because they are hungry or out of habit. Generally, puppies tend to be hungry and will look for food in the middle of the night. When the dogs grow up, they will no longer do so. Puppies need to eat more than three meals a day, and larger puppies may eat more. You can prepare dog food for the dog in the middle of the night before going to bed to prevent the dog from barking when it cannot find the food. Wake others or neighbors.