With Shiffons,  one parent is a pure bred Brussels Griffon.  The other is a purebred Shih Tzu.   Again,  you get the best of both breeds.  Some litters will favor more the look of one breed than another.  Griffs are so intelligent. can be quite athletic.  Both breeds are companion dogs and in the toy group.  These are pictures from previous litters to show for example only.  

The above litter is out of a Griff Mom and a Shih tzu Dad.
The litter below is out of a Shih tzu mom and a Griff Dad.
My experience has been that Shiffons will favor the mother in looks.