I just posted this on your other thread. Sorry it may not be much help as it helped the thickness of Callie's hair but not the length.
Aww that's too bad. He is still such a handsome boy.
When Callie was younger she actually developed bald spots. The vet gave me some Omega 3 fatty acid oil to put on her food once a day. Her coat thickened up almost immediately! She just turned 9 mos. old and her coat looks about like Jacob's as far as length. It is taking forever for it grow long! I have heard that it can take up to 3 years for them to get their full coat. :?