Female dogs usually give birth to puppies when they are two to three years old. Dogs generally have their first estrus when they grow to about 8 months old. At this time, the dog has reached sexual maturity and can have children. However, it is generally not recommended to breed a dog when it is in estrus for the first time. Because the dog's body is not fully mature when it is eight months old, breeding at this time is not conducive to the development of the fetus and is not good for the female dog.

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Sexually mature female dogs can become pregnant and give birth if they mate during the estrus period, but sexual maturity does not mean that they have reached the age for breeding. , because sexual maturity and physical maturity are not synchronized. If you breed too early, the litter size may be small, the offspring may not be strong or the embryo may die, and it may also affect the growth and development of the breeding dog itself.