When Lexie came home at 10 weeks her coat was the same. I was so used to seeing those very fluffy furball yorkie pups and thought her coat seemed so thin especially on her legs and rough in some places. It turned out she has a slow growing silky coat and the rough hair was just puppy hair. Now her legs still haven't completely filled out yet but she only just turned 1 so i'll be patient
Here's pics of her thin puppy coat