Our expert says:
Dogs will have their cycle twice a year, but this process and the time and bleeding is actually very different from and at different times to that what happens in women. In the dog, when she comes on heat (called oestrus) the vagina will swell and haemorrhage may start. As soon as the haemorrhage stops, she is ready for mating. This whole process can take about three weeks. This is different to people, where the bleeding is as result of stripping of the lining of the uterus, AFTER the uterus was most susceptible to falling pregnant.
Dr Malan van Zyl
Veterinary Specialist Physician
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