Yorkies have different types of coats, some do not grow much and are coarse or wiry. If this is the type of coat Claire has there are no hair products that will make it grow but there are conditioners that will make it silkier feeling. I've been using and recommending Iv San Bernard products, their PEK conditioner is absolutely the best hair conditioner I've ever tried, and believe me, I've tried just about all of them. If you would like more information on the ISB products, PM me...or, you can read more here....
http://www.yorkietalk.com/forums/yor...-jencar98.html
Btw, your Claire is a cutie!