First confirm that the female dog's vagina has obvious swelling and flushing or the first drop of blood is seen, and then the first drop of blood is started to be marked as day 1. Subsequently, primary birth dogs (female dogs that have not given birth to dogs) can usually mated for the first time on days 11 to 13, while multi-born dogs (female dogs that have given birth to dogs) can mated for the first time on days 9 to 11.
Every 2 years of age or every 2 litters of parity, the first mating will be moved forward by 1 day. Some mother dogs have multiple births and their vaginas stop bleeding after 5 days of estrus. In this way, the best time for breeding on the 6th or 7th day is.
There are a few female dogs who do not experience vaginal bleeding during the early and estrus periods. Some female dogs have blood samples and secretions that can last until the estrus period, and may even last for several days in the late estrus. Such dogs cannot determine the breeding date by observing whether vaginal bleeding is not required. At this time, the male dog can be tested. The female dog is willing to undergo a mating period of 1 to 3 days after the male dog is mating.
If you do not pay attention to the start date of vaginal bleeding in the female dog, you can also determine the best breeding date based on the color change of vaginal secretions: that is, the color of vaginal secretions, and 2 to 3 days after the change from red to straw yellow, you can mating. At this time, the female dog's labia is soft, and the vaginal vestibule in the original vertical state becomes straight, which is conducive to the insertion of the male dog's penis.