Do Dogs Have Periods? Dogs in Heat, Estrous, and Menstrual Cycle

As a pet owner, you may have wondered if your female dog goes through a monthly period like humans. While there are some similarities, dogs have their own reproductive cycle. In this article, we’ll discuss the different stages of a dog’s reproductive cycle, including estrous and heat, and address some common questions about dog menstruation.

What is the Estrous Cycle?

The estrous cycle is the reproductive cycle of female dogs. It is also known as the “heat cycle” or “season.” This cycle is marked by changes in the dog’s behavior, physiology, and hormone levels. Unlike human menstruation, which occurs on a monthly basis, the estrous cycle occurs about twice a year in dogs.

During the estrous cycle, the dog’s ovaries produce eggs, and the uterus prepares for a potential pregnancy. If the dog mates and becomes pregnant, the cycle ends. If not, the dog will go through another cycle in a few months.

What Happens During the Heat Cycle?

The heat cycle is a specific stage of the estrous cycle. During this stage, the dog is receptive to mating and may show changes in her behavior. The heat cycle typically lasts around three weeks and is characterized by three stages:


This stage lasts around 9 days and is marked by the dog’s vulva swelling and the appearance of bloody discharge. The dog may also become more restless and start to attract male dogs.


This stage lasts around 9 days and is when the dog is most receptive to mating. The discharge becomes lighter in color, and the dog may actively seek out male dogs.


This stage lasts around 60 days and occurs if the dog does not become pregnant. The discharge stops, and the dog’s reproductive system returns to normal.

Do Dogs Menstruate?

Dogs do not menstruate in the same way that humans do. Menstruation is the shedding of the uterine lining, which does not occur in dogs. Instead, dogs expel the lining as part of their discharge during the proestrus stage of the heat cycle.

It’s important to note that if you notice any irregularities in your dog’s discharge or behavior during her heat cycle, you should consult with a veterinarian to rule out any potential health issues.

Can You Prevent a Dog from Going into Heat?

Yes, there are several options available to prevent a dog from going into heat, including spaying and medication. Spaying is a surgical procedure that removes the dog’s ovaries and uterus, effectively ending her reproductive cycle. Medication can also be used to prevent or delay the onset of the heat cycle.


Understanding your dog’s reproductive cycle can help you provide better care and address any potential health issues. While dogs do not have periods like humans, they do go through a heat cycle that is marked by changes in behavior and physiology. If you have any concerns about your dog’s reproductive health, consult with a veterinarian.

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Van Hellen

Being a dog parent has never felt this good. Here at Wheaten Dogs, finding the best essentials for your dog is our top concern. My mission is to provide information and latest updates, especially about best dog products, to dog owners and lovers alike.

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