During the dog's aunt period, the swelling of the water gate is normal. At this time, the female dog's vulva is swollen. This is caused by the change of hormones in the dog's body. The vulva is swollen. Generally, the vulva will bleed from 1 to 7 days, and from 7 to 7 days, the vulva will swell. 15 days is the best time for breeding. Generally, the swelling of the vulva lasts for 15 to 25 days. This is a normal physiological phenomenon. You don’t need to worry too much. You just need to maintain hygiene during the menstrual period.

When dogs are menstruating, they will lick their vulva constantly, and the vulva will be red and swollen with pink discharge. They like to be close to male dogs, and are willing to accept the male dogs climbing on them, or take the initiative to sniff the male dog's genitals. If breeding is not performed, symptoms usually disappear after menstruation ends.