The bitch in heat will produce phermones that will attract males. Many males will surround a female dog living in the street. The female dog will select a male and allow a single male to mount. The male dog will sniff and lick her vulva it means that she is receptive of the male’s attention. Females will allow the males to mate only during oestrus cycle, which will last for approximately twenty-one days and this cycle usually occurs every six to seven months. Unlike females, male dogs would always be ready to mate.

Female dog will flag or hold the tail to one side, so that the male can easily penetrate the vulva. Male dog’s don’t need erection to penetrate as its penis contains a bone called baculum. Once the penis enters, blood will surge to the erectile tissues at the base of the member. There will be a clamping response in the vulva once the penis swells up with blood. Now the member will be trapped and both the dogs will stuck together for long period, say, 30 minutes. Immediately after penetration and swelling of its member, the male dog usually swings the legs over the bitch. This will made the dogs to face opposite directions while mating is progressing.

After 30 minutes, once the dog has complete ejaculated, both dogs will disengage. The sperm will transferred inside the vulva to make the female pregnant 100%.