How do you know when a female is in heat?

How do you know when a female is in heat? Signs seen during this phase include a swollen vulva, blood-tinged discharge, excessive licking of the genital area, clingy behavior, and aggression toward male dogs. Your dog may also hold her tail close to her body. Estrus: The estrus phase is the mating phase where your female dog will be receptive to males.

Signs seen during this phase include a swollen vulva, blood-tinged discharge, excessive licking of the genital area, clingy behavior, and aggression toward male dogs. Your dog may also hold her tail close to her body. Estrus: The estrus phase is the mating phase where your female dog will be receptive to males.