How does the Dog Heat Cycle Calculator work?

Proestrus (days 1–9): bloody discharge; not receptive Then: Oestrus (days 9–14): receptive; fertile window Then: Progesterone testing gives most accurate ovulation timing Then: Average cycle interval: 6 months (range 4–12 months).

Can you give an example of how to use the Dog Heat Cycle Calculator?

Example: Input Cycle started 1 March gives a result of Fertile window approx 9–14 March; next cycle approx September.

Is the Dog Heat Cycle Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Dog Heat Cycle Calculator?

Our Dog Heat Cycle Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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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.

Symbol	Name	Unit	Description
CycleStart	First day of heat (proestrus)	Date	—
CycleDays	Cycle length	Days (typical 21)	—
FertileWindow	Peak fertility window	Days 5–14 of cycle approximately	—

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

References

›Canine reproduction — VCA Hospitals

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Dog Heat Cycle Calculator

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Canine Oestrous Phases

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Dog Heat Cycle Calculator