Natural Breeding.Responsible breeders generally do not breed a bitch at the first heat, to avoid imposing the stress of pregnancy and lactation on a young, growing animal.

• 自然交配负责任的繁育者不会在母犬第一次发情时即给其配种，以免怀孕给较年幼、还在生长阶段母犬造成过大的身体负担。