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					Originally Posted by StewiesMom  what is the process?  
Finding  dogs who are excellent representations of the breed that have clean genetic lines. The point of breeding is to improve the breed - to have the puppies be standard conformation and also weed out genetic defects common to Yorkies  
do you have to registered all your dogs with AKC, etc?  
AKC is the most reputable organization. You can't just register any dog w/ the AKC; their parents need to be registered and their litter's registration needs to be sent in by the breeder.   
do you need a license?   
Not usually.   
You probably shouldn't breed any dogs that you got at pet stores. You don't know their historys or what their parents looked like or anything else. Dogs from pet stores are usually from puppymills. Check out this site: http://www.stoppuppymills.org/ | 
 
    
  
 
  MY thoughts  exactly! 
We are not trying to be mean or hurtful here but you obviously need to go to the breeders thread and read every word there , then get some good books, which any breeder can reccommend for you and start with that.  Go to shows and LEARN,LEARN.LEARN.  It takes years and it's still a learning process but FIRST-START WITH THE BEST FOUNDATION STOCK THAT YOU CAN BEG BORROW OR STEAL ( not literally )the money for.  You should just enjoy the baby you have as a pet BUT DO NOT BREED HER.  I have never known of a pet store to have anything close to breeding quality.  To be breeding quality takes more than the name Yorkshire Terrier and long hair. You need to study till you understand dog registries and the differences between them and their requirements. 
I am only trying to save you the heartache of a bad breeding which produces mostly poor quality puppies.  Yes I know some get lucky and actually get one or two passable pups but if you stick with the old thought that vet bill are usually less on quality bred dogs and trust me that it is just as cheap to feed a good dog as a poor one ( that last is meant as a joke ). 
If you sincerely want to become a breeder then get a mentor breeder and study a bunch,