Understanding the common behaviors of a female dog in heat can help you prevent, or encourage the birth of puppies. The heat cycle, also known as the estrus cycle, is the time when your dog can conceive puppies. This blog post will delve into the common behaviors exhibited by a female dog in heat, equipping you with the knowledge to better understand and care for your dog during this time.
Understanding the Heat Cycle
Before diving into behaviors, let’s quickly review what the heat cycle entails. It typically occurs twice a year, starting as early as six months of age in smaller breeds. The cycle consists of four stages: proestrus, estrus, diestrus, and anestrus.
The length of a female dog’s heat cycle depends on her breed and age. It can range from two days to 21 days, with an average of six to 12 days.
1. Changes in Behavior and Mood
When a female dog enters her heat cycle, you may notice behavioral changes. She may appear anxious or more alert due to the increase in hormones. Additionally, she might seem more affectionate, clingy, or even irritable.
Other common behaviors include increased restlessness, vocalization, and seeking out male dogs. Female dogs may also become more protective of their territory and exhibit aggression towards other dogs.

2. Increased Urination
Frequent urination is a common sign of a dog in heat. This isn’t just due to physical changes but is also a way for your dog to signal her reproductive availability to male dogs. She’s essentially marking her territory with pheromones that indicate she’s in heat.
3. Swelling of the Vulva and Discharge
During the proestrus stage, the first sign of heat, your dog’s vulva will become swollen, and she may have a bloody discharge. As she progresses into the estrus stage, the discharge will become less bloody and more straw-colored.
4. Flagging Tail
As your dog moves into the estrus stage, she may exhibit a behavior known as “flagging,” where she raises her tail to one side, signaling to male dogs that she’s ready to mate.
5. Attraction of Male Dogs
If you notice male dogs becoming suddenly interested in your female dog, she’s likely in heat. Male dogs can pick up the scent of a female dog in heat from miles away, and they might linger around your house more often.

6. Changes in Appetite
Just like with humans, changes in hormonal levels in female dogs can affect their appetite. During the heat cycle, the surge in hormones can result in different behavioral changes, one of which might include a fluctuation in appetite.
Some dogs may eat less than usual when they’re in heat. This might be due to the discomfort associated with the cycle, or because their body is simply reacting to the hormonal changes. They might also be more focused on the changes happening in their body and pay less attention to their food.
On the other hand, some female dogs might eat more than usual. This could be due to increased activity (like restlessness or increased territorial behavior) during this period, which can lead to higher energy expenditure and a bigger appetite.
It’s also possible that a female dog in heat may not show any changes in appetite. Each dog is unique, and their reactions to the physiological and hormonal changes of the heat cycle can vary widely.
Navigating the Natural Heat Process
Knowing these common behaviors can help you understand and navigate this natural process with your dog. However, keep in mind that these signs can also indicate health problems. If your dog’s behavior or physical symptoms seem extreme or cause you concern, it’s always best to consult your veterinarian.
If you do not intend to breed your dog, consider having her spayed. Spaying is a routine surgical procedure that prevents female dogs from going into heat and eliminates the risk of unwanted pregnancy. Spaying can also prevent certain health issues, like uterine infections and breast cancer.
Remember, as a pet parent, understanding your dog’s behaviors and needs, including those during her heat cycle, is integral to ensuring her happiness and health.