Will A Dog’s Heat Cycle End After Mating? (Demystified!)

As a breeder or dog owner planning to breed your dog at some point in their lifetime, it is crucial to understand your dog’s heat cycle timeline and generally how a dog’s heat cycle works. Without further ado, does mating mark the end of your dog’s heat cycle? What should you expect after mating?

The dog’s heat cycle is not affected by mating and goes on regardless of whether mating occurs or not. To make it clear, the heat cycle should not be confused with heat (the estrus phase of a dog’s heat cycle) which also does not end after mating but immediately after conception occurs.

The heat cycle is a biological event in female dogs influenced by hormonal fluctuations in your dog. This causes various physical and behavioral changes including one that makes them receptive to mating during estrus. The estrus phase of a dog’s heat cycle is always followed by diestrus whether the bitch mated or not

The only way to completely end heat cycles in a female dog is through spaying or ovariohysterectomy – surgical removal of the ovaries and uterus. This is done for dogs whose owners do not plan to breed throughout their lifetime. There is also a condition known as ovarian remnant syndrome, where a piece of ovarian tissue is left behind during spaying and this tissue releases sex hormones that can cause your dog’s heat cycle to continue.

Understanding Dog’s Estrus Cycle

The female dog’s heat cycle, also known as the estrous cycle, is a recurring reproductive cycle that is used to determine when a dog comes into heat or can become pregnant if she mates with a male dog. This cycle typically happens about twice a year, although it can vary between breeds and individual dogs.

The estrous cycle comprises four distinct stages: Proestrus, Estrus, Diestrus, and Anestrus.


The proestrus stage marks the beginning of the heat cycle. During this stage, the female dog’s body begins preparing for a potential pregnancy. The dog’s vulva swells and may seem sensitive, and she will start to secrete a bloody discharge. This is a clear sign to male dogs that she is entering her heat cycle, attracting them, but she will generally reject their advances at this point.

Her behavior might also change, showing signs of restlessness or discomfort. This stage typically lasts for 7 to 10 days, but it can vary between dogs.


This is the stage when the female dog is ready to mate and can get pregnant after mating. A dog in this phase of the heat cycle is said to be in season or heat.

Her previously bloody discharge will lighten in color and might become straw-colored or clearer. The dog’s vulva will still be swollen. She will be more receptive to male dogs during this stage, which is a clear sign she is ready to mate. One notable behavior is the “flagging” of her tail, where she moves her tail to the side when a male dog is near. This stage usually lasts around 9 days, but it can be as short as three days or extend up to 21 days.


This stage follows the end of the estrus phase or fertility window regardless of whether or not mating and fertilization occurred during estrus. If the dog is pregnant, her body will start producing hormones to support pregnancy, and physical changes will become more evident as her pregnancy progresses.

During this stage, the vaginal discharge stops, and her vulva will return to its normal size. The diestrus stage lasts about 60 days if the dog is pregnant, and around 90 days if she is not.


The anestrus stage is a period of rest before the next heat cycle begins. During this stage, there are no visible signs of heat, and the dog’s body returns to its normal hormonal state. This period of inactivity lasts for about four to five months.

Keep in mind that these stages and their duration can vary widely between individual dogs, breeds, and the age of the dog. Always consult with a vet or breeder if you’re planning on breeding your dog or if you notice any irregularities in her heat cycle.

Will A Dog Heat Cycle End After Mating?

Mating does not end a dog’s heat cycle. The heat cycle of a female dog is a natural biological process that follows a set pattern, regardless of whether mating occurs or not. However, it’s important to note that the ‘heat’ a female dog experiences (the estrus phase) is the period during her cycle when she is receptive to males and can conceive.

When a female dog mates during her estrus phase, it’s possible that she may become pregnant. However, even after a successful mating, her cycle will continue onto the next phase – the diestrus stage.

During the Diestrus phase, a dog’s body will change to adjust to a potential pregnancy. If conception has occurred, your dog will experience hormonal shifts that support gestation and fetal growth. The typical canine pregnancy lasts around 63 days, almost aligning with the Diestrus stage’s length, which is approximately 60 days.

A viable solution to a permanent cessation of heat cycles in female dogs is by opting for a surgical intervention known as spaying or ovariohysterectomy. This procedure involves the complete removal of the ovaries and uterus, and it is typically chosen by dog owners who have no plans for breeding their pets.

However, it is important to be aware of a potential complication called ovarian remnant syndrome, which arises when a fragment of ovarian tissue remains inadvertently after spaying. This residual tissue can continue to release sex hormones, thereby sustaining the dog’s heat cycles.

Will Dog’s Heat Cycle Stop If She Gets Pregnant?

No, a dog’s heat cycle does not stop if she becomes pregnant. The term “heat cycle” encompasses all four stages of a dog’s reproductive cycle: proestrus, estrus (commonly referred to as “heat”), diestrus, and anestrus. Each of these stages occurs in sequence and the cycle as a whole usually repeats every six months, although this can vary depending on the individual dog and breed.

When a dog becomes pregnant, what changes is her progression through these stages. If a dog mates and becomes pregnant during the estrus stage, she will move into the diestrus stage as usual. However, the diestrus stage will now coincide with her pregnancy, lasting about 60 to 64 days, which is the typical gestation period for dogs.

During diestrus (and her pregnancy), her body will produce hormones to support the pregnancy, including the maintenance of the uterus lining and the development of the puppies.

After giving birth, the dog will eventually move into the anestrus phase, the resting period of her cycle. Later, she will start a new cycle, beginning with the proestrus phase.

So, while pregnancy occurs within the dog’s reproductive cycle, it does not stop or reset the cycle. The dog simply progresses through the stages as normal, with hormonal and physiological changes supporting the pregnancy.

how to know if dog mating is successful?

Determining whether mating has been successful and your dog is pregnant can be tricky without professional assistance. Here are some signs that may suggest your dog is pregnant:

Change in appetite: Early in pregnancy, your dog may experience a decrease in appetite. This can include a complete refusal to eat or just eating less than usual. As pregnancy progresses, her appetite will usually increase.

Changes in behavior: Pregnant dogs often show changes in behavior. This can include being more affectionate than usual, or conversely, showing a desire for solitude. Some dogs may also become more protective or display nesting behaviors as the pregnancy progresses.

Physical changes: As the pregnancy progresses, you may notice an increase in your dog’s weight and a swollen abdomen. This typically becomes evident halfway through the pregnancy. Towards the end of the pregnancy, you may also be able to see and feel the puppies moving inside your dog’s belly.

Nipple enlargement: One of the earliest signs of dog pregnancy is enlarged or darkened nipples. This happens as her body prepares to feed the coming puppies.

Morning sickness: Just like humans, dogs can experience morning sickness during pregnancy. However, this symptom is not observed in all dogs.

Increased urination: Your dog may urinate more frequently than usual due to the pressure from the enlarged uterus on her bladder.

If you suspect your dog may be pregnant, it’s best to consult with a vet. Pregnancy can be confirmed with an ultrasound, which can detect a pregnancy as early as three weeks into the gestation period. A veterinarian can also conduct a physical exam or blood test to confirm pregnancy.

Remember that these signs are not definitive proof of pregnancy and could indicate other health issues. If you see any drastic changes in your dog’s behavior or physical condition, it’s always a good idea to consult with a vet.

How do you know when a dog’s heat is over?

Determining the end of a dog’s estrus phase, also known as being ‘in heat’, is essential to avoid unwanted pregnancy or for breeding purposes. The following signs indicate that your dog’s estrus phase might be concluding:

Absence of Vaginal Discharge: During the estrus phase, female dogs typically exhibit a lighter-colored vaginal discharge, which can be straw-like or clear. The conclusion of this phase is often marked by a significant decrease in discharge volume, ultimately leading to its cessation.

Behavioral Changes: Dogs in heat tend to be more receptive or attracted to male dogs, a behavior known as ‘flagging’. This involves the female lifting her tail to the side. As the estrus phase ends, you’ll notice a reduction in such behavior.

Decrease in Vulva Swelling: Throughout the heat cycle, the vulva of a female dog becomes swollen. This swelling diminishes when the estrus phase is over, with the vulva returning to its regular size.

Hormonal Changes: While not observable to the naked eye, there are hormonal shifts that occur as a dog moves out of the estrus phase. Specifically, progesterone levels rise as a dog transitions into the diestrus stage of the reproductive cycle. Veterinarians can confirm these hormonal changes through blood tests, which can provide a more precise understanding of your dog’s cycle.

When is the best time for a dog to mate in her heat cycle?

The best time to breed a dog during her heat cycle is typically when she is in the estrus stage, also known as the fertile stage. This stage occurs after the initial stage called proestrus, which is characterized by the presence of bloody vaginal discharge. During proestrus, the female dog is not receptive to mating.

Once proestrus ends, the fertile period begins. This is when the female dog’s estrogen levels rise, and her vulva becomes less swollen. The vaginal discharge also changes from bloody to clear or straw-colored fluid. It is during this time that the female dog is most receptive to mating and has the highest chance of becoming pregnant.

The fertile period in dogs usually lasts for about 5 to 7 days, but it can vary depending on the individual dog. It is important to closely monitor the female dog’s behavior and physical signs to determine the optimal time for breeding. Signs of receptiveness include increased friendliness towards male dogs, a willingness to be mounted, and a relaxed posture.

To maximize the chances of successful breeding, it is recommended to have the female dog examined by a veterinarian who can perform tests to assess her reproductive readiness and help determine the best time for mating. This may include hormonal tests or vaginal cytology to evaluate the stage of the heat cycle and the presence of ovulation.

Breeding a dog at the appropriate time during her heat cycle increases the likelihood of successful conception and pregnancy. It is important to note that responsible breeding should be done with careful consideration of the health and well-being of both the female and male dogs involved, as well as the potential care and placement of the resulting puppies.

What To Expect From A Female Dog After Mating?

Here are various occurrences or signs to expect from a dog after mating:

Fertilization: Mating does not guarantee instant pregnancy. While the immediate signs of a successful mating encounter are visible, it’s important to understand that conception takes place when fertilization occurs. Sperm can survive in the female’s body for several days, while the egg remains fertile for up to 48 hours. It’s during this window that the union of sperm and egg leads to conception.

Belly and Nipple Swelling: As the pregnancy advances, the pregnant dog’s belly will gradually expand due to the growing size of the developing puppies. Additionally, the nipples will undergo changes, becoming larger and more prominent in preparation for nursing the puppies once they are born.

Decreased Physical Activity: As the pregnancy progresses, it is normal for the pregnant dog to exhibit decreased physical activity and energy levels. The physiological changes taking place in her body can lead to fatigue and a preference for rest. Ensuring she has a comfortable and quiet space where she can relax is important for her well-being.

Morning Sickness: Just like in human pregnancies, some dogs may experience morning sickness during the first few weeks after mating. This is attributed to hormonal changes and fluctuations in blood pressure. It’s important to provide support and care for the pregnant dog during this time by offering small, frequent meals and ensuring she stays hydrated.

Increased Affection: Pregnancy can bring about behavioral changes in dogs, and many pregnant females seek more attention and affection from their owners. They may display heightened sensitivity and a desire for comfort. Providing reassurance and spending quality time with the pregnant dog can help create a supportive environment.

Your Dog’s Appetite Is Affected: Pregnancy can cause fluctuations in a dog’s appetite. Some pregnant dogs may experience an increase in appetite as their bodies require additional nutrients to support the growing puppies. On the other hand, some may have a reduced appetite due to hormonal changes or other factors. Monitoring the pregnant dog’s food intake and providing a balanced and nutritious diet is important for her and the puppies’ health.

Abrupt Weight Increase Or Decrease: The changes in appetite and metabolism during pregnancy can lead to weight changes in the pregnant dog. Depending on her circumstances, she may experience weight gain or weight loss. Regular monitoring of her body condition and consulting with the veterinarian can help ensure that she maintains a healthy weight throughout the pregnancy.

Fetal Movement: As the pregnancy progresses, it is possible to feel or observe the puppies moving inside the pregnant dog’s belly. This can be a delightful and exciting experience for dog owners, as it provides a tangible connection to the developing puppies.

Nesting Behavior: Pregnant dogs instinctively exhibit nesting behaviors as they approach labor. They may collect blankets or clothes to create a cozy space for giving birth and raising their puppies. Scratching surfaces, circling, and pacing in the chosen area are common behaviors that indicate their readiness to give birth.

Dam Becomes Restless: Approaching labor, pregnant dogs may exhibit restlessness and behavioral changes. They may sleep less, and exhibit pacing, panting, and shivering. It is important to create a calm and comfortable environment for the pregnant dog during this time, providing her with a designated nesting area where she can prepare for the upcoming birth.

Labor: Labor occurs in three stages – the first stage involves internal contractions, the second stage is the actual delivery of the puppies, and the third stage is the expulsion of the placenta. Each stage has its unique characteristics and timeframes, and it is important to be attentive and supportive throughout the labor process.

Do Dogs Still Bleed After Mating?

After dogs mate, it is possible for them to still experience bleeding, although it is not very common. The bleeding that occurs after mating is usually a result of the physical trauma and friction that can happen during the mating process. This can cause small tears or abrasions in the vaginal tissues, leading to some bleeding. Another possible reason is prolonged proestrus bleeding, where the proestrus phase of the heat cycle lasts longer than usual and the dog experiences heavy and abnormal bleeding.

Bleeding may also occur due to pyometra, a serious condition where the uterus becomes infected and enlarged, leading to the release of pus and bloody discharge. Vaginitis, Urinary tract infections, forcible separation of dogs during mating, and blood clotting disorders are other possible causes.

If a female dog is bleeding after mating, it is important to monitor the bleeding and ensure it is not excessive or accompanied by other concerning symptoms. If the bleeding is excessive, persists for more than a few days, or is accompanied by symptoms like swelling, discomfort, or excessive licking, it is recommended to seek veterinary attention. A veterinarian can perform a physical examination and appropriate tests to determine the underlying cause of the bleeding and provide necessary treatment.

It’s worth noting that bleeding after mating does not necessarily mean a female dog cannot become pregnant. Vaginal bleeding is not an indicator of fertility or pregnancy problems. However, it is generally advised to avoid breeding during the proestrus stage of the heat cycle, where bleeding normally occurs. If there are concerns about a dog’s reproductive health or fertility, consulting with a veterinarian is always recommended.

Final Thoughts

Mating does not mark the end of a dog’s heat cycle, as it is a natural biological process that continues regardless of whether mating occurs or not. It is important to note that the heat cycle consists of different stages, including proestrus, estrus, diestrus, and anestrus, each with its characteristics and duration.

If you do not plan to breed your dog, spaying or ovariohysterectomy is a reliable method to permanently stop heat cycles. However, be aware of the potential complication of ovarian remnant syndrome, where residual ovarian tissue can sustain the heat cycle by releasing sex hormones.

Knowing the signs and stages of a dog’s heat cycle, understanding when a dog is fertile, and recognizing the signs of successful mating or potential pregnancy is essential for responsible breeding. If you suspect your dog may be pregnant, consult with a veterinarian for proper confirmation and guidance throughout the pregnancy.

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