I'm struggling with puppy fur myself. First, Krypto's fur is getting winter-plush, as is Uhura's.
At the same time, this is when German shepherd's start to lose their puppy coat, I understand, making way for their adult coats.
That means shedding, and daily grooming during that change.
However, the Furminator is removing more coat than I want it to right now, so we've switched to a less effective comb, because I, too, am worried that my pup will freeze this winter if I keep getting too much fur out! Sheesh!
Love All Life, Thank You For Posting! :)