Bella was eight months and then had her second season at 11 months (both verified by the vet as we were a bit surprised!!) We walked her on lead in deserted places, but frankly rather than dogs looking for Bella, we had more problem with her looking for dogs. If she so much as saw another dog she was desperate to get to them.
Also, both times, we've noticed that rather than go off ger food, she has been ravenous. And I think the only thing that made her fed up, was the lack of off lead walks, especially the first time which seemed to go on for ages.