To use this Royal Canin dry dog food for giant puppies, simply serve it to your puppy as their main meal. The amount you feed depends on your puppy's age, weight, and activity level. Check the feeding guide on the bag for more specific instructions. Make sure your puppy always has access to fresh water. When it comes to storage, keep the bag in a cool, dry place to maintain the food's freshness. If you notice any changes in your puppy's behavior or health after starting this food, consult your vet. Also, gradually transition your puppy to this food over a few days to avoid digestive upset. Just mix a small amount of the new food with their old food and slowly increase the proportion of the Royal Canin food.