Sex

Proestrus is the first stage of a female Border Collie's reproductive cycle and lasts around nine days. Hormonal shifts during this period cause the vulva to enlarge and a bloody vaginal discharge to be released. Even when the female is showing symptoms of receptivity to mating during proestrus, she may still reject the overtures of male canines.

Estrus follows proestrus and typically lasts around 9 days, however this might vary from dog to dog. Changing vaginal discharge color from bloody to straw-colored indicates that you are in the mating-receptive phase. Some female Border Collies may exhibit behaviors associated with mating, such as aggressively searching for male dogs and "flagging" their tails to the side. This is the stage when most matings are successful.

Crucial ovulation often occurs around halfway during the estrus period. Female dogs, in contrast to humans, do not wait until after mating to lay eggs. For successful breeding, time is of the essence. When intentionally breeding Border Collies, it's important to closely observe the female's behavior and discharge patterns. Seeking advice from a veterinarian may also help with this.

The last two stages of a woman's reproductive cycle, metestrus and diestrus, occur after ovulation, after estrus. If a pregnancy does occur, the pregnant woman will show signs of gestation in her body and behavior.

Estrus triggers heightened odors and actions in male Border Collies, making them more attracted to females. However, not all men show a great deal of interest in females while they are in heat, and the amount of attraction might vary. If you don't want to breed your male canines, you must keep them under close control and secure them.