Ok, so yesterday all the boys had professional grooming. My groomer was concerned about the lack of coat on Liam. His coat is very sparse. No undercoat to speak of. It seems weird as both his parents carried massive coats. She asked if I had done a thyroid test on him. So, just curious, if anyone else has encountered this in their young shelties... he is 16 months now. I have attached a few pictures for reference. I guess I always felt Thyroid tests were for older dogs... like 5 or 6. Thoughts?