I have other questions:
Why are both your dogs intact?
Do you plan to show your dogs?
Do you plan to breed your dogs?
What research have you done about breeding and your breed in particular if you plan to breed?
No, a fence will not keep them apart, and your bitch in season will not be safe outdoors when she is in season no matter how she is fenced.
When I have a bitch in season, she is either crated inside my house or she is WITH ME period.
Mother nature has ways of ensuring that procreation happens. Get ready for endless whining, screaming, scratching, digging, panting, and a male dog that does not eat.
Get ready for a smelly messy female who will try just as hard to get to the boys as the boys will try to get to her.
Be prepared to be on the alert for about 60 days after each season for infections or pyometra on the part of your girl.
Your best tactic is to have one OR BOTH of them altered. Keeping an intact male to use on the female you have is not really wise, since if you have the female, you have an entire country of the top males to choose from.
Just my first 2 cents worth....