So I have 4 months old GSD puppy. He is starting to have the adult fur pattern on the back. Is there a way at this age or 5-6 months to know how long his adult hair is gonna be? I have seen some very long long haired GSD and very short Long haired GSD. Some have way more fur on head even at adult age while some grow nice long hair evenly by 1-2 years of age. Is there some hair that could determine his adult hair like hair on ears or on paws etc?