Dog Heat Cycle Predictor
Stay prepared for your dog's next cycle. This calculator helps you estimate when your female dog will enter her next heat and identify her most fertile window.
How often do dogs go into heat?
Most dogs go into heat twice a year, approximately every 6 months. However, this can vary by breed and individual dog. Smaller breeds may go into heat 3-4 times a year, while giant breeds may only go into heat once every 12-18 months.
How long does a dog stay in heat?
A dog's heat cycle typically lasts between 2 and 4 weeks. The most fertile period is usually during the second stage (estrus), which lasts about 9 days.
What are the stages of a dog's heat cycle?
The cycle consists of four stages: Proestrus (bleeding and swelling), Estrus (fertile period), Diestrus (pregnancy or recovery), and Anestrus (hormonal rest).
At what age do dogs first go into heat?
Most dogs have their first heat cycle between 6 and 12 months of age. Small breeds tend to start earlier, while large and giant breeds may not have their first heat until they are 18-24 months old.