Generally speaking, the best age for a bitch to reproduce for the first time is between 18 months and 3 years old. Complications may occur on bitches over 3 years old, and rebirth of puppies is not recommended.

Bitches cannot have puppies when they are 7-8 years old. Female dogs will not have menopause, but the number of estrus will decrease with age, thus stopping childbirth in disguise.

Dogs aged 7-8 are already very old and cannot have children. Otherwise, they may be dangerous in childbirth or pregnancy, and will cause great damage to the bitch's body.

If the owner does not want to breed the female dog, it is best to sterilize it as soon as possible. This can effectively avoid genital diseases in the dog's old age, especially breast cancer, and at the same time save a lot of troubles when the dog has menstruation.