Generally speaking, the heat cycle of a dog lasts for approximately three weeks, with the fertile period occurring during the middle 10-14 days. During this time, the female dog will be most attractive to males and most likely to conceive if she mates.
To ensure that your female does not come into contact with any male dogs during her fertile period, it's best to keep her isolated for at least three weeks. This means keeping her indoors or in a secure outdoor area where she cannot come into contact with any males.
It's also important to remember that even after the heat cycle has ended, your female dog may still be fertile for a short period of time. Therefore, it's essential to maintain separation between her and any male dogs for at least three weeks after the end of her heat cycle.
By following these guidelines, you can help prevent unwanted pregnancy and ensure the safety and well-being of your female dog during her heat cycle.