Are Pregnant Dogs Aggressive? Signs To Look For

When it comes to being a pet owner, there are many aspects that need to be taken into consideration. One of the most important questions that owners should ask themselves is, “Are pregnant dogs aggressive?”

It’s no secret that pregnancy can bring out certain changes in behavior in any animal – and this includes our beloved furry friends.

In this article, we’ll explore the possible signs that your dog may be pregnant, as well as ways to help manage the situation if they do become aggressive.

So whether you’re expecting a pup or just want to ensure your pet remains happy and healthy, read on for all the answers you need!

Are Pregnant Dogs Aggressive?

Pregnant dogs, like all animals, may experience changes in behaviour during their pregnancy. In some cases, these changes can manifest as aggression and it is important for pet owners to be aware of this possibility.

Signs that your dog may be pregnant include weight gain, increased appetite, nesting behavior and restlessness. If you notice any of these signs in your pet, it is best to visit the vet for a proper diagnosis.

If you do find that your dog is pregnant and showing signs of aggression, it is essential to take steps to manage the situation safely and effectively. Avoid scolding or punishing your pet for aggressive behavior as this will only make matters worse. Instead, focus on providing a calm environment with minimal distractions.

You should also ensure that your dog receives plenty of exercise and mental stimulation through activities such as playtime or training sessions. If necessary, consult a professional behavioral specialist who can provide additional support and guidance if needed.

Ultimately, understanding the potential changes in behavior that can occur during pregnancy can help owners prepare themselves and their pets for the journey ahead.

6 Signs of a Pregnant Dog 

If you have an intact female dog, it is important to be aware of the signs that she may be pregnant.(1) While there are many different signs that can indicate a pregnancy, here are 6 common indicators to look out for:

1. Increased Appetite: One of the first signs of a pregnant dog is an increased appetite. This will usually start in the early stages of pregnancy and continue throughout.

2. Morning Sickness: Pregnant dogs may experience morning sickness in the first few weeks of their pregnancy, similar to human mothers-to-be. Vomiting and nausea are common symptoms during this time.

3. Weight Gain: As the fetus grows inside your pet’s body, her weight will increase significantly over the course of the pregnancy. It is important to pay close attention to any unexpected or drastic changes in your dog’s weight as this could indicate other underlying health problems rather than just being pregnant.

4. Enlarged Nipples: As hormones increase during pregnancy, your dog’s nipples may become larger and more pronounced as they prepare for nursing puppies after birth.

5. Nesting Instincts: A few weeks before giving birth, some dogs may exhibit nesting instinct behaviors such as restlessness and seeking out quiet places or trying to create a nest with blankets or towels scattered around the house.

6. Fluid Discharge from Vulva: Finally, towards the end of her pregnancy your dog may start to show signs of labor by producing a discharge from its vulva similar to clear mucus or bloody fluids for up to 24 hours before giving birth – known as “waxing” – which should

Female Dog in Heat Behavior

When a female dog is in heat, her behavior can become quite aggressive. She may be more likely to bark and lunge at other dogs and humans, and may even become hostile if a male dog tries to mount her.

This is because when a female dog is in heat, her estrogen levels skyrocket which can make her moody and irritable. During the proestrus stage of her cycle (which typically lasts about 9 days) she will display signs of aggression as well as licking her genital area excessively.

It’s important to take extra care during this time by avoiding crowded places with other dogs and keeping an eye on any interactions between your pet and other animals.

If your female dog has been acting aggressively while in heat, it’s best to consult with a veterinarian or animal behaviorist who can recommend solutions for controlling the behavior.

In some cases, they may suggest spaying your pet as this can help reduce the risk of aggressive behaviors caused by high hormone levels.

What Age Will My Dog First Go into Heat? 

Are pregnant dogs aggressive

A female dog’s first heat typically occurs at around 6 months of age, with larger breeds taking up to 12 months. During this time, her estrogen levels will spike and she may become more aggressive. Owners should be mindful of the signs that their pet is going into heat and take extra precautions to ensure the safety of their pet and those around them.

To determine when your female dog may start her cycle, look for signs such as increased licking of the genital area, aggression, restlessness or changes in mood. These symptoms usually occur during the proestrus stage which lasts approximately nine days.

It’s important to keep a close eye on your pet during this time as some dogs can be more prone to aggression due to the hormonal changes they are experiencing.

If you’re unsure when your female dog may reach sexual maturity, it’s best to consult with a veterinarian who can help you understand when she may go into heat and what steps you can take to ensure her safety and well-being during this time.

Being aware of your dog’s reproductive cycle can help minimize any potential risks associated with aggressive behaviors caused by high hormone levels.

How Long Will Her Cycle Be?

A female dog’s cycle typically lasts up to 21 days, but it can be shorter or longer depending on the individual. During this time, her estrogen levels will remain elevated and she may display signs of aggression.

It’s important to note that during the proestrus stage, which is the first week of her cycle, your pet may become particularly aggressive as her hormones are at their peak. After this initial period, however, most female dogs will settle back into their normal behavior patterns.

It’s also important to understand that even after her cycle has ended, your pet may still exhibit some signs of aggression due to the lingering effects of her hormones. For this reason, it is critical that owners remain attentive and prepared to intervene if they notice any aggressive behaviors in their pet.

Also, spaying your female pup can help reduce the risk of unwanted pregnancy as well as minimize any potential bouts of aggression associated with her reproductive cycle.

How to Calm a Dog in Heat

When a dog is in heat, it can be difficult to manage their behavior. It’s important to understand that during this time, female dogs may become more aggressive due to the hormonal changes they are going through.

Fortunately, there are several techniques owners can employ to help calm their pet and reduce any aggression.

The most important step for owners is to provide plenty of exercise for their pet. This helps burn off excess energy and can cause them to sleep more, which can help reduce stress levels.

Taking your pup on daily walks or runs and playing fetch with them are also great ways of providing physical activity.

In addition, owners should create a calm environment for their pup while they’re in heat by limiting distractions like loud noises or unfamiliar people coming into the house. Keeping things as low key as possible will make it easier for the dog to relax and feel safe during this period.

Finally, providing your pet with plenty of love and affection during this time is essential; cuddles and belly rubs can go a long way towards calming her down!

Behaviour of Male Dogs Around a Pregnant Female

When it comes to male dogs and pregnant females, there are a few things to keep in mind.

Firstly, it is important to remember that female dogs may become more aggressive due to the hormonal changes they are going through during their heat cycle. Therefore, it is best to separate your male dog from the pregnant female until she has given birth.

It is also important to note that male dogs may act differently when faced with a pregnant female. Due to their heightened sense of smell, they may become overly protective and territorial towards her, often trying to guard her or even mounting her as a sign of dominance.

This behavior should be discouraged with firm but kind corrections and by providing plenty of distractions away from the pregnant female dog such as toys, treats or walks.


Pregnant dogs may experience changes in behavior during their pregnancy, including aggression. Pet owners should be aware of the signs of pregnancy and take steps to manage any aggressive behavior safely and effectively.

Female dogs in heat can also exhibit aggressive behavior due to hormonal changes, and owners should take extra care during this time. Understanding the reproductive cycle of dogs and providing plenty of exercise, a calm environment, and love and affection can help reduce aggression.

Male dogs may act differently around pregnant females and should be separated to avoid potential aggression or dominance behaviors.

Overall, being aware of the potential changes in behavior during pregnancy and heat cycles can help ensure the safety and well-being of dogs and their owners.

Scroll to Top