My daughter's Siberian Husky is just a little over two years old. He still has the majority of his puppy fur.

Mostly the sides of his body. The top of his back and the length of it down to his behind seems to be adult fur. Is this okay? We met another Sibe the same age at the dog park and he had a full coat of adult fur with no sign of puppy fur. He was also larger than our Sibe. We seem to think we have the runt of the litter. Could that be why he still has most of his puppy fur? Is there something we should have done to have the puppy fur grow out and the adult fur grow in? Just curious, I love my grandpuppy either way!!