JMO - but never liked the idea of people purposely breeding mixed pups -Topknotch does (shows on her website). But that is just how I feel. There are so many unwanted pups - better to adopt a mixed breed from the Humane Society and give them a great home (and in some cases save their life).
P.S. My original kennel name in Florida - back in the 80's was Topnotch Yorkies.
T.