The heat cycle last for approximately 3 weeks. The female will usually bleed the first 7 to 9 days and then the discharge will turn to a light pink color or stop all together. The period when the female is most likely fertile is the 9th through the 16th day but many yorkies have been known to accept a male all the way to the 21th day or beyond.
I also need to add that once a female is ready to breed she can get very persistent and aggressive toward the male. They really like to flaunt it.
Last edited by bjh; 10-27-2009 at 07:27 PM.
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