When Do Dogs Get Their First Period?

When do dogs get their first period and how long does it last? Learn everything you need to know about your dog’s first heat cycle.

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Dogs are creatures of habit, and their bodies go through regular cycles. Just like humans, female dogs experience a monthly hormone cycle which leads to changes in their behavior and bodily functions.

The beginning of this cycle is called their “heat” or “estrus” period. During this time, their bodies are preparing for reproduction and they undergo a number of physical and behavioral changes. Let’s take a closer look at when do dogs get their first period and what you can expect during this time.

What is a Dog’s First Period?

Dogs generally go into heat for the first time between six and twelve months of age. The average is probably somewhere around eight or nine months. But this can vary a great deal from one dog to another, and is also influenced by factors such as breed, nutrition, and general health. Some smaller breeds may come into heat as early as four or five months old, while some giant breeds may not reach maturity until eighteen months or even two years of age.

When Do Dogs Get Their First Period?

Dogs typically go into heat for the first time when they reach maturity, which is around 6 to 12 months old. Smaller breeds tend to mature earlier than larger breeds. But before a dog’s first heat, she won’t be able to get pregnant.

How Can You Tell If Your Dog Is In Heat?

Most female dogs will have their first heat cycle between 6 and 12 months old. However, small breeds may start a little earlier and giant breeds may start a little later.

There are a few physical signs that you can look for to tell if your dog is in heat. One is that her vulva will swell and she may have a bloody discharge. She may also be more clingy than usual and want to be around you all the time.

Your dog’s behavior may also change when she’s in heat. She may seem restless, agitated, or even aggressive. If you have more than one dog, you may notice that they start fighting more than usual. This is because the female dog emits a pheromone that can be picked up by male dogs from miles away.

How Long Does A Dog’s Heat Cycle Last?

The heat cycle of a female dog lasts approximately three weeks. The first week is the proestrus phase, during which the dog’s body prepares for ovulation. The second week is the estrus phase, during which the dog is most fertile. The third week is the diestrus phase, during which the dog’s body begins to prepare for another heat cycle.

How Often Do Dogs Go Into Heat?

Dogs go into heat usually twice a year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breeds tend to have more frequent cycles, and some giant breeds only come into season once a year. In general, though, you can expect your female dog to go into heat about twice a year.

The timing of your dog’s first heat cycle will depend on her breed and size. Small breeds tend to come into season as early as six months of age, while large breeds may not reach puberty until they are one-and-a-half to two years old.

Can You Spay A Dog While She Is In Heat?

No, you cannot spay a dog while she is in heat. The ideal time to spay a female dog is prior to her first heat cycle, which typically occurs between 6 and 12 months of age. Waiting until your dog is out of heat does not have any adverse effects on the surgery or recovery; however, if you wait too long, your dog may become pregnant.

What Are The Benefits Of Spaying Your Dog?

There are many benefits to spaying your dog, which is why the American Society for the Prevention of Cruelty to Animals (ASPCA) recommends that all pet parents have their female dogs spayed. Spaying, which is also called ovariohysterectomy, involves the removal of a dog’s ovaries and uterus.

Some of the benefits of spaying your dog include:

-Reduced risk of mammary cancer: Spaying your dog before her first heat cycle can reduce her risk of developing mammary cancer by 99 percent.

-No more heat cycles: Heat cycles can last anywhere from two to four weeks, during which time your dog may experience vaginal bleeding, mood swings and a heightened interest in males. Spaying eliminates heat cycles.

-Puppy Mills: By spaying your dog, you help reduce the demand for puppies from commercial breeding operations, also known as “puppy mills.” Puppy mills are large-scale commercial breeding facilities that mass-produce puppies for profit, often at the expense of the dogs’ health and well-being.

-Wandering: Unspayed female dogs are more likely to roam away from home in search of a mate. This increases their risk of getting lost or being hit by a car. Spaying eliminates this behavior.

Are There Any Risks Associated With Spaying Your Dog?

Are there any risks associated with spaying your dog? While spaying your dog can offer many health benefits, there are also some risks to consider. Spaying your dog too early or too late can increase the chances of certain health problems developing. There are also some risks associated with the surgery itself. Talk to your vet about the risks and benefits of spaying before making a decision.


In conclusion, the answer to when do dogs get their first period is that it can vary depending on the individual dog. Some dogs may have their first heat cycle as early as six months old, while others may not have it until they are a year or older. However, the average age for most dogs to have their first heat cycle is between six and twelve months old.

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