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.
Yes Maxi junior is good for 4 month German shepherd dog Breed. You can also go through the specifically for Royal Canin German Shepherd Junior also.
While someone intends in switching to a new dog food, it must occur several health issues such as gas, loose stool or many other physical problems and that is why it is crucial in selecting the new dog food which has prepared with the balanced nutrient diet along with including in the easiest digestible categorized. It is better to take advice from pet nutrient experts and veterinary specialist.
During the transition to the new dog food, it has to abide several precautions that related to the health development issue or exhausting with physical inner organs of a pooch. But almost of the time, it is better to be considered after once taken the advice of the pet food expert or veterinary physician.