A dog's period usually lasts about 7-14 days, but it may last 21 days or longer. During the estrus period, female dogs will show some obvious symptoms, such as swelling of the vagina, increased secretions, frequent urination, and attraction to male dogs. Pet owners need to pay close attention to the physical condition of their dogs in order to detect abnormalities in time.

The estrus period of a dog refers to a series of physiological and physiological changes that a female dog displays in order to reproduce offspring after it reaches sexual maturity. Behavioral changes. During this stage, the female dog will be receptive to the male dog for mating and may become pregnant. The duration and frequency of estrus vary depending on factors such as your dog's breed, age, health, and living environment.