A small amount of fluid will flow out during a dog's period, which will last for 10-15 days. The female dog's genitals will gradually become swollen on the 10th day of the period, and the swelling will be completely reduced by the 16th day after the period. At this time, the female dog's estrus period has ended.

Tip:

Adult female dogs will have two menstrual periods every year, and the interval between the first and second menstrual period is half a year.