Dog Heat (Estrus) Cycle Calculator
Predict the next heat dates and best AI/service timing for a dog (bitch) from the last observed heat (cycle ~180 days).
Optimal service/AI timing: mate around days 10–14 of proestrus/estrus; progesterone testing pinpoints ovulation. A bitch cycles only about twice a year (~6-month interval), not on a short repeating cycle.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Breeders use the free Dog Heat Cycle Calculator to predict the next heats and time insemination correctly — the single biggest driver of conception rate.
About Dog Heat (Estrus) Cycle Calculator
Timing breeding to the heat (estrus) cycle is what makes the difference between a pregnant animal and a wasted service. A bitch cycles only about twice a year (~6-month interval), not on a short repeating cycle. From the last observed heat, this tool projects the next three expected heat dates and reminds you of the optimal service window (mate around days 10–14 of proestrus/estrus; progesterone testing pinpoints ovulation.) plus when to do a pregnancy check if she isn't seen in heat again. Good heat detection and timing lift conception rates and shorten the calving interval.
How to use Dog Heat (Estrus) Cycle Calculator
- 1Enter the date heat was last observed.
- 2Read the next expected heat dates.
- 3Time service/AI to the recommended window, and pregnancy-check if heat returns.
Why use Dog Heat (Estrus) Cycle Calculator?
- ✓Uses the correct ~180-day cycle for dog (bitch)
- ✓Projects the next several heat dates
- ✓States the optimal AI/service timing
- ✓Free, instant and fully in-browser
Frequently asked questions
How long is the heat cycle of a dog?+
About 180 days. A bitch cycles only about twice a year (~6-month interval), not on a short repeating cycle.
When is the best time to inseminate a dog?+
Best timing: mate around days 10–14 of proestrus/estrus; progesterone testing pinpoints ovulation.
What if the animal returns to heat after service?+
A return to heat at the next cycle usually means she didn't conceive — re-inseminate at that heat. If she doesn't return, pregnancy-check from the date shown to confirm.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline at the farm and your data never leaves the device.
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