Please get your dog spayed. It is not that risky of a surgery. I recently lost my beloved Mandy (who you see in my avatar) to pyometra. We didn't get her spayed due to a birth defect in her heart and getting her spayed 'was' a risk. Her life expectancy was only 2 to 3 years and she had just passed her 5th birthday. Still, had she not got pyometra she may have lived longer.