Dog Heat Cycle Calculator
Date of Last Heat Cycle
Female dogs cycle typically every 6 months. The fertile window (oestrus) is approximately days 9–14. Understanding the cycle helps with breeding or prevention.
- 1Proestrus (days 1–9): bloody discharge; not receptive
- 2Oestrus (days 9–14): receptive; fertile window
- 3Progesterone testing gives most accurate ovulation timing
- 4Average cycle interval: 6 months (range 4–12 months)
Cycle started 1 March=Fertile window approx 9–14 March; next cycle approx September
| Phase | Duration | Sign |
|---|---|---|
| Proestrus | 7–10 days | Bloody discharge |
| Oestrus | 5–9 days | Receptive; fertile |
| Diestrus | 60–90 days | Pregnancy or false |
| Anoestrus | 4–5 months | Resting |
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