It is perfect timing to test your female for health and breeding quality. There are genetic testing, liver shunt testing, OFA testing for knees and hips and eyes. The YTCA has suggested tests to perform, as well as many more that should be tested for. Since the goal for breeding is to improve the breed and produce the highest quality, healthy babies, please study your female's lines and background for health problems, do your health testing, and ask that of your stud. Don't take any stud just for puppies.
Breeding can be very dangerous for your female, with so many things that can go wrong! I promise you that breeding Yorkies is nothing like breeding any other breed!
If she's showing no heat cycles, I would take her to the Vet and check for Pyometra too.
__________________  Deb Sillers
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