Paul Mitchell has a "Tea Tree" line of shampoos and conditioners. I know, because I picked some up when I went for my bi-weekly haircut. Then, my girlfriend discovered the stuff...and the next thing you know...she basically hijacked the whole bottle. She uses it on herself and our beloved yorkie.
Here is the product.
http://www.paulmitchell.com/site/sub...ection=2,10,32 http://www.paulmitchell.com/images/l...aTree_care.jpg
I picked some up at my local Supercuts. They were running a promotion of 1 bottle of shampoo and 1 bottle of conditioner for a price of roughly $22 (I think). A little pricey for some, I know..but it was a better deal than purchasing the bottles seperately. That, and you can use them yourself...not just your Yorkie.
Just as a personal note for us, don't use this stuff on your own hair daily. Maybe once every few days or once a week. While the cooling sensation is nice,...it can dry out our scalps if used daily.
Regarding our Yorkies, it leaves my Yorkie's coat to be extremely soft and quite nice. The smell is a "minty" or eucalyptus smell.
Some other companies are selling shampoos w/ Tea Tree oils in them, but Paul Mitchell is the one that I know about.