How long is a German shepherd fertile?

A female German Shepherd typically experiences a heat cycle approximately every six months, during which she is fertile for about 2 to 3 weeks. The most fertile period occurs around 10 to 14 days after the onset of her heat. During this time, she may attract male dogs and be receptive to mating. It's important to monitor her behavior and consult a veterinarian for guidance on breeding and health.