Heat Cycle Calculator
Calculate your dog's next heat cycle and fertile days
Frequently Asked Questions
How often does a female dog go into heat?
Most female dogs go into heat twice per year, every 6-8 months. Small breeds may cycle every 4-5 months, while very large breeds (e.g., Great Dane) sometimes only once a year. The first heat occurs between 6 and 24 months of age.
How long does a dog's heat cycle last?
The entire heat cycle lasts about 21 days (3 weeks). Proestrus lasts 7-10 days with bloody discharge. Estrus lasts 5-9 days when the female is receptive to mating. Metestrus follows with 9-12 weeks of hormonal decline.
When can I spay my dog after her heat?
Ideally 2-3 months after the heat, when hormone levels are lowest. Spaying during heat increases bleeding risk. Discuss the optimal timing with your veterinarian.
