female wont stand for male dog

Question
Hi there

I have a male and female bullmastiff and our female is in season.  We tried to mate her with our male on day 10 and 12 of her season and she will not stand for him as soon as he mount her she sits down.  can you help me on matter many thanks

Answer
Hi Michelle

You could still be early for her.  

Regardless, sit on a chair and have the female straddle your lap. Front legs on one side, back on the other.  Make sure you can support her and raise or lower her with your knees.

Bring the male around to the business end. When she goes to sit down, your knees are there to support her.

Good luck.