How many days after heat will a female dog be ready to mate?

A female dog typically becomes receptive to mating about 9 to 14 days after she enters heat, which is also known as estrus. During this time, she will exhibit behavioral changes that indicate her readiness to mate, such as increased affection and a willingness to mate with male dogs. The exact timing can vary based on the individual dog and her breed. It's important to monitor her closely during this period to ensure successful breeding if that is the goal.