Dog Heat Cycle Calculator
Track your dog’s heat cycle and predict the next season
Last Heat Start Date
Cycle Length
Understanding Your Dog’s Heat Cycle
The canine estrous cycle has four phases. Understanding them helps you plan for breeding, prevent unwanted pregnancy, or simply know when to take extra precautions with intact male dogs nearby.
Heat Cycle by Breed Size
| Breed Size | Cycle Frequency | Heat Duration |
|---|---|---|
| Small breeds | Every 5-6 months | 2-4 weeks |
| Medium breeds | Every 6-7 months | 2-4 weeks |
| Large breeds | Every 7-9 months | 2-4 weeks |
| Giant breeds | Every 12-18 months | 2-4 weeks |
FAQs
How long does a dog stay in heat?
Most dogs are in heat for 2-4 weeks, though the fertile window (estrus phase) is only about 5-9 days. The average is 3 weeks total from first signs of bleeding to the end of swelling.
How do I know my dog is in heat?
Signs include: bloody vaginal discharge, swollen vulva, frequent urination, excessive licking of genitals, and increased attention from male dogs. During estrus, the discharge lightens and the female becomes receptive to males.
Conclusion
Our dog heat cycle calculator helps you track and predict your dog’s reproductive cycle. For breeding planning, combine with our dog pregnancy calculator. For general health, use our dog age calculator.