Enter the first day of your dog’s heat (bleeding) to estimate the peak fertile window and ideal breeding dates.
Peak Fertility Window
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Best Mating Dates
Heat Cycle Roadmap
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Proestrus Phase: Initial swelling and bleeding. Males are interested, but the female will typically not stand for mating.
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Estimated Ovulation: The most critical time. Progesterone levels typically rise rapidly during this window.
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Ideal Breeding Window: Breeding is usually most successful 2 days after ovulation when eggs are fully mature.
Breeder’s Tip: While calculators provide an average, “silent heats” or irregular cycles are common. For the best success rate, perform Progesterone Testing at your vet starting on Day 7 of the heat cycle.
