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In domestic dogs, sexual maturity (puberty) occurs between the ages of 6 to 12 months for both males and females, although this can be delayed until up to two years of age for some large breeds. Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle.
Males like the female dogs attain puberty at different ages. Different breeds reach maturity at different times with the smaller breeds attaining it at a much younger age. The average age for reaching puberty is around 6-12 months of age, depending on the type of breed.