The feeding guidelines have mentioned on the pouch as in print message based otherwise you can take the advice of a veterinarian expert/physician.
The dry dog food lasts for 1 year without any damaging or food poisoning, but those should have packed in tight seal pouch and required to keep away from moisturizing weather how much it is possible. After once opened the dry dog food’s pouch it should have to feed your dog within six months anyhow.
As its name shows Royal Canin Giant Puppy is suitable for all the Giant Dog Breeds Like Great Dane,Bull Mastiff,English Mastiff,St. Bernard,Neapolitan Mastiff etc.
It depends upon the several breeds whose have the several categories/characteristics in themselves regarding on their physical shape & size, but mostly we have noticed it so intensively that the pet experts have identified them as the adult dog among all breeds of dogs after having seen their physical formations which have included in 6 months old some are considered to be 1 year as an adult dog and others are selected more than that also.
In generally, the Rottweiler breed is including in the giant breed due to its inheriting with big and potential body shape/size. Having seen their potential body shape, the animal experts have chosen them as giant breed and in providing such breed of dog with the easiest digestible along with best nutritional dog foods would more beneficial. You can feed your Rottweiler the Royal Canin Giant Starter, 4kg, Pedigree puppy Large Breed 10KG, Pedigree Puppy Dog Food Chicken Milk 3 KG pack etc.