The mating age of dogs should depend on the situation. Generally speaking, puppies should not start mating before they are sexually mature, that is, between 6 and 12 months old. Because their bodies are not fully developed, mating may cause health problems. In addition, if the puppies are mated without the guidance and supervision of the breeder, it may lead to problems with breeding behavior, such as a decrease in breeding quality, dystocia for the female dog, etc.
Most dogs reach sexual maturity between 6-18 months, and the specific period of sexual maturity depends on their breed and individual. Some smaller breeds may even reach sexual maturity in around 6 months, but larger breeds may take longer.
In addition, even if a dog has reached sexual maturity, it should first undergo a comprehensive health examination and consider its genetic background, blood relationship and other factors. If you wish to breed your dog, it is best to consult with a professional breeder or veterinarian beforehand and ensure that mating occurs under appropriate circumstances.