Natural breedings don't always occur. Timing is critical. Even when you think the time is right, the female may refuse to stand for the male or the male may not be interested in the female.
If nature proceeds normally, the female's vulva will enlarge and soften as the time nears to breed. She may begin to tease or "flag" the male that the time is right and the time is now or never....The male and female will engage in a period of play and foreplay. The male will attempt to mount the female within minutes of this foreplay. If the female Click here to read the rest of this article ...
Dog Breeding Secrets