Dogs typically stay in heat for about 2 to 4 weeks, with bleeding lasting around 7 to 10 days during this period
. The heat cycle, also called estrus, includes several phases: proestrus (about 7-10 days with swelling and bleeding but no mating), estrus (the fertile phase lasting 3 to 21 days when the dog is receptive to males), diestrus (about 2 months after heat), and anestrus (a resting phase lasting 3 to 5 months)
. During heat, dogs are fertile and can become pregnant, especially around day 10 of the cycle
. The frequency of heat cycles is usually about twice a year, roughly every 6 months, though this can vary by breed, size, and age
. In summary:
- Heat duration: 2 to 4 weeks
- Bleeding duration: 7 to 10 days
- Heat cycles per year: About 2 (every 6 months)
- Fertile period: During estrus phase, roughly days 10-14
This variability depends on individual dogs, but these are the typical ranges for most female dogs
