What are signs of a female dog going into heat?

When female dogs go into heat, they’re entering estrus, the stage in their reproductive cycle when they can become pregnant. Depending on the size of your dog, heat can begin when they’re anywhere from 6 to 24 months old. In general, the smaller the dog, the sooner they go into heat.

A dog’s first heat cycle normally lasts between 3 and 4 weeks. After a dog has entered heat for the first time, it then occurs every 4 to 8 months, or about twice a year. Some dogs enter heat in a consistent time frame, while others’ cycles may vary; neither is usually a sign of larger health concerns. If your dog starts to show signs of entering heat a month or two after just going through heat, however, it could be a sign of a health issue that your vet should check out.

4 Signs Your Dog Is Going into Heat

The most frequent symptoms before heat include:

1. Swollen Vulva

Located just below the anus, your dog’s vulva will turn redder in color and increase in size — often 2 to 3 times its normal size.

2. Behavior Quirks

A dog entering heat can become more skittish or aggressive around others, including people and animals but especially other dogs.

3. Increased Licking of the Vaginal Area

While almost all dogs occasionally lick themselves in this area, you may see it much more frequently before they go into heat.

4. Vaginal Bleeding

If you notice bloodstains near or around areas where your dog rests, it’s likely your dog is in proestrus and the heat phase is about to begin. Dogs may bleed for up to 10 days during this phase.

4 Signs Your Dog Is in Heat

Once your dog is in heat, you may notice physical and behavioral changes, and changes in how other dogs behave around her. Here are the most frequent signs your dog is in heat.

1. Decrease in Vaginal Bleeding

The amount of blood typically decreases when your dog is in peak heat. Once this occurs, your dog is in the most fertile stage of estrus for about a week to 10 days, until bleeding starts again (although bleeding doesn’t always recur).

2. Mating Behavior

When your dog is around other dogs (both male and female), her behavior will be noticeably different. This may include mounting other dogs or letting herself be mounted. If no other dogs are around, your dog might try to mount your legs.

3. Switched Tail Position

Once she is fully in heat, your dog’s tail will often move or curl to the side. This is known as flagging and lets male dogs know she is ready and available for mating.

4. Male Dogs React Differently

If you have male dogs in your household or come across one on a walk, they’ll react differently to your dog in heat. This could include aggression toward other male dogs or increased barking and whining. They may also show much greater interest in your dog’s genital area.

How do I know if my dog is on heat?

You can sometimes work out if your female dog is coming into heat through various signs. The more aware you are of your dog’s cycle, the more prepared you can be to help care for her needs. This can include:
Swelling

The vulva, near your dog’s tail, can become engorged and swollen. This is not always obvious.

Bloody discharge This can vary in volume from dog to dog, and even between cycles with the same pet. The discharge your dog passes during her heat cycle will change as her cycle progresses. Initially It may appear very bloody, but as time passes, it will thin and become a watery pinkish red colour.

Marking and Frequent Urination

You might notice your dog having more bathroom breaks and urinating more during her heat cycle. You may even notice her marking, leaving small amounts of urine in various places in the yard or on a walk. This is normal. During this phase of your dog’s cycle, her urine contains more hormones and pheromones which she uses to indicated to other dogs that she is fertile.

Licking

You might notice your female dog excessively licking her genital area. This can indicate that she is cleaning herself and is in heat.

Behaviour Changes

You may notice your female dog’s behaviour change just before and while she is in heat. She may appear more agitated, nervous or aggressive during her heat cycle. You might also note mounting and receptive behaviour changes towards male dogs.

Tail Position

Your dog will hold her tail in different positions during the stages of her cycle.

What are the 4 stages of heat?

During the heat cycle your dog will experience four phases. Each stage is accompanied by different changes in her body and behaviour and they are as follows:
Proestrus Bleeding and swelling of the vulva. The proestrus stage of the heat cycle is where your dog’s body is preparing to mate, she may be clingier to you during this time and also more aggressive towards male dogs. You may notice your dog holding her tail close to her body during this stage.

Estrus

Your dog is fertile and ready to mate. The estrus stage of the heat cycle is where you may notice your female dog becomes more receptive to males, this is because she is fertile and ready to mate. During this phase of her cycle, she may still be having lighter bleeding and discharge which is often a straw colour. You may notice your dog holding her tail to the side and approaching males. She may also be more aggressive to other female dogs during this stage.

Diestrus

Your dog may be pregnant or no longer fertile. The diestrus stage occurs right after the proestrus and estrus or “in heat” stages of your dog’s cycle. If not pregnant her vulvar swelling will decrease and discharge disappear. If she has been mated, then during this time she may develop into pregnancy.

Anestrus

The dog is getting ready for their next cycle.

The anestrus stage is like the body’s standby mode. This is the inactive phase of your dog’s cycle where she doesn’t experience any hormonal or sexual behaviour changes.

How do I know when my dog has finished heat?

When your dog enters the Diestrus phase she has finished heat. Her behaviour should return to normal, discharge subsite and sewing of her genitals will go down. This is usually 2-3 weeks after you have noticed the last of her bloody discharge.

How often will my dog go into heat?

Dogs will experience heat, on average, every 6 months. It can take up to 12 months for your dog’s heat cycle to become regular. Smaller breeds can experience heat more frequently, having up to 4 heat cycles per year. Larger and giant breeds may experience heat even less having only once cycle every 12 to 18 months. Unless desexed, your female dog will never stop having heat cycles, however the time between heat cycle will become further and further apart as your pet ages.

There is no link to indicate a breeding season for domestic dogs, so your dog may go into heat during summer, autumn, winter or spring. There are only 2 domesticated dog breeds with cycles that correspond to season, these are the Tibetan Mastiff and Basenji who typically only cycle in Spring.

How soon after my dog has finished her heat cycle, can she be desexed?

When your dog is in heat, there is an increased blood flow to both the uterus and ovaries. Dogs can be desexed while they are on heat, but there is an increase risk for bleeding. Most vets will recommend waiting 8 weeks after your dog has finished bleeding before they are desexed.

How Can I manage it & care for my dog?

Heat can be messy and lengthy, and overall, not too fun. These are some simple tips and tricks to keep your fur baby comfortable and clean.
Invest in a good pet nappy
Finding a quality pet nappy can help you kept your dog and home clean while she is in heat. You can keep her close without the stress of mess. The Dundies Snappie is a great option – you can read more about choosing the right dog nappy here.
Comfy Bedding and Blankets Dogs can get a little more sensitive when they are on heat, providing a special blanket or bed for her can help her feel more comfortable. It also keeps mess contained to one easy clean area if you choose not to use a pet nappy.

Keep Wipes on Hand

Heat can be messy, having a packet of baby wipes on hand ready to go can help keep your home clean.

Extra Cuddles

Some dogs can get quite snuggly during their heat cycle, so make sure to make time for extra cuddles. Also make sure you dog has plenty of access to fresh clean water.

Chew Toys or Soft Toys

Providing some extra mental stimulation and security with toys can help to keep your pet feeling calm.

Don’t Scold
If your dog does make a mess with blood, it was not intentional. She may already be stressed if she is waking up and finding herself in a messy state, scolding her will just add extra stress. Rather provide comfort and cuddles while you clean.

How can I keep my dog safe?

When your dog experiences her first heat cycle, it can be a nerve-racking experience. These are some things you can do as a responsible owner to care for your female dog in heat.
Supervise your dog at all times Never let your dog outside alone during heat. Male dogs who smell your female dogs’ pheromones can come from far and wide to mate, don’t underestimate their determination. If you do, you may end up coming home from getting groceries to find the male dog from around the block has climbed your six-foot fence and is mating with your girl.

Avoid off leash play areas

Avoid dog parks and off leash play areas when your dog is in heat. Even if your dog has excellent recall, she may find herself influenced by her hormones if she is intent on finding a male dog to mate with. Sticking to an on leash walk in an area you are confident in taking her would be the better option for exercise.

Microchips and ID

We never want our pets to get lost, but if there is a time when they are more prone to wander, it will be during “heat.” Make sure their microchip details are up to date and that she is wearing a collar with your details easily accessible if the unthinkable happens.

Keep an eye on her health

Sometimes health issues can arise for your dog. After the heat cycle when the uterine lining remains thickened in preparation for pregnancy, it can produce more fluid creating an ideal environment for bacteria to grow. This can cause pyometra, a uterine infection. This can be life threatening. Keep an eye out for excessive drinking, decreased appetite, return of discharge or bleeding, lethargy and or fever. If you suspect any of these symptoms, please seek the advice of your veterinarian immediately.

Desexing

If you are not a registered breeder or your dog doesn’t need to remain entire for purposes such as showing, why not consider desexing your pet! Your vet will be able to provide guidance as to the ideal age and time to perform a desexing surgery for your dog.

Recommended Products

Keeping our pets clean and comfy while they are on heat is made easier with these fantastic Dundies recommended products:
ID Pet Tags and Collar – Pupstyle Logo ID Tag & Collar
Nappies – The Dundies Snappie
Bed Covers – The Dundies Puppy Pad
Cosy Bed – Indie Boho Pet Bed with washable cover
Fun Toys – Furry and Fabulous Toys, Puzzles and Feeders.