The first stage is called the proestrus stage and last from 4 to 9 days. During this time you will see a bloody discharge.
The second stage is called the estrus stage and last from 4 to 13 days. During this stage the discharge will be more yellowish in color. This is the prime time for mating. She will allow any and all males to approach her and will do what is called "flagging". Flagging is moving her tail up and to one side to allow the male to mount her.
She should be in or close to being in the estrus stage. Look for the yellowish discharge and her vaginal area should be swollen. If she is ready she will allow him to mount her and should even back her rear end into him. Do not force it if she is not ready, this may make the male shy away from her when she does become ready.
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