There are numerous articles from many very qualified and well informed people, on why the Yorkshire was bread.
When you repeatedly verify how that took place, you'll see that actually well have little Varminteer Hunting Dogs which are Scent Hounds as well. And, just to add Icing to that cake, it seems that the Females are better at it than the Males.
The Yorkshire was put together VERY well, Kudos to the people who did that !