Lacy's Mom - you said preety much what I said.
Destiny and Pooh - since your job is in researching, then you should be able to find out very quickly if you should use Pooh as a stud or not. And especially since you gratuated with a BA in Animal Science - you also should kinda know about breeding.
Please check out the ytca.org site on standard. Do you have and know Pooh's pedigree? That is very important, as you know and learned in school. Also - a yorkie should be square - too tall is not highly recommended. He will most likely be over the weight standard, but he may stop (slim but can happen). And there is no such thing as "teacup." Just all FYI for you to know and learn. I know it is so hard to hear all these things since you are his mom.
We just want to let you know the information to help you, not to be mean. You asked, so we are trying to help you.
Just before you go through it - be very well informed so you can make an educated decision. Breeding dogs is not glorious or fun or clean.
Best Regards,
T.