The estrus period of a dog is actually commonly known as "dog trouble". The first time for female dogs to estrus is generally over 6 months old, and the seasonality is more obvious, usually once in spring and autumn. A few bitches only get estrus once a year, while others get estrus three times. The obvious characteristics of female dogs in estrus are: redness, swollen vagina and bloody secretions.

The seasonal estrus of male dogs is not as obvious as that of female dogs, and they often become estrus due to the stimulation of in vitro hormones in the female dogs. The characteristics of male dogs in estrus are to follow the female dog, lick the female dog's vagina, crawl on the back, and become aggressive.

Generally speaking, female dogs have red and swollen vaginas, and their bloody secretions are 9 to 15 days (on average 12 days), and then they will ovulate, and they can mate and become pregnant.

Many friends think that as long as the dog has early estrus, it can mate. In fact, sexual maturity does not mean that you can mate and have children.

Generally speaking, female dogs often have not yet reached physical maturity when they first become estrus, and the body organs, including the birth canal, have not yet developed well. At this time, mating can also become pregnant, but the number of children is small and the chance of difficult labor increases, which will hinder the development of the body. Therefore, it is best not to mate for the first time in estrus.

Mating timing: mating during the ovulation of the female dog. As mentioned earlier, mating is most suitable when a female dog has vaginal bleeding that is about to end (about 9th to 15th days). It is generally possible to mating on the 10th day.