Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

When Do Border Collies Go into Heat? Vet-Approved Facts & Tips

sad and worried border collie dog lying on a wood floor

Border Collies are fun, loving dogs, but this is not your average dog breed. They require a great deal of attention, care, and commitment from their human companions and would prefer to have some kind of job. Owning a female Border Collie also means preparing for and managing their heat cycles if they are not spayed.

Most Border Collies have their first heat at about half a year old, though this is not a fixed rule. Some Border Collies can go into their first heat earlier than the 6-month mark, while others can experience their first heat later, around the 1-year mark. There is no right or wrong timeline here.

Female Border Collies that go into heat “early” or “late” can be just as healthy as those that go into heat at the average 6- to 8-month mark. Having an idea of how your Border Collie’s heat cycles work and the signs of said cycles will help ensure that you’re prepared to offer proper care and attention as necessary.

divider dog paws 3 oct 2024

How Often Do Border Collies Go into Heat?

The typical female Border Collie will experience a heat cycle twice a year, about 6 months apart from one another. That said, some dogs go into heat only once a year, while others go even longer between heat cycles. Many things go into the timing of a dog’s heat cycle, including size, diet, lifestyle, and health. It may take a few cycles before timing gets into a rhythm, and owners can accurately predict when a cycle will begin. It is important to keep in mind that unlike humans, dogs do not go through menopause and will have heat cycles throughout their entire lives.

female border collie lying on grass
Image By: Elayne Massaini, Shutterstock

What Are the Stages of a Border Collie’s Heat Cycle?

Four stages make up a Border Collie’s heat cycle, and it is important to understand each one in order to properly care for and protect your dog from unwanted pregnancies.

Stage 1: Proestrus

This first stage of the heat cycle generally lasts between 7 and 10 days. During this time, the female’s body is preparing itself for insemination and ovulation. The proestrus stage may produce bloody discharge from the vulva. Most females are not interested in mating at this point, so they may become aggressive toward males that try to mate.

Stage 2: Estrus

The estrus stage is when a female Border Collie is fertile and can successfully mate with a male. This stage tends to last between 5 and 10 days, and during this time, a female may seek out a male to mate with.

Stage 3: Diestrus

This stage usually takes 10 to 90 days. The hormonal changes will cause the female to no longer be receptive to the male. Depending on the events that occurred during the estrous cycle, the female could be pregnant or not.

Stage 4: Anestrus

This is the longest stage of a Border Collie’s heat cycle, as it is the resting stage. The anestrus phase lasts from the last day of diestrus to the first day of proestrus, no matter how long that might be. At this time, your dog should display no signs of being in heat.

divider dog paws 2 oct 2024

What Are the Signs That a Border Collie Is in Heat?

When a Border Collie goes into heat, her hormones lead to both physical and behavioral changes, albeit temporary ones. When a female goes out of heat, these changes subside and are typically eliminated.

female border collie lying
Image By: Tepepa79, Shuterstock

If your dog shows one or more of the following signs, it could indicate that she is going into heat:

  • Vulva swelling and redness
  • Pink color or bloody discharge
  • Anxiety
  • Increased vaginal licking
  • Mood swings
  • Submissive or aggressive behavior
  • Agitation
  • Frequent urination
  • Changes in body odor
  • Energy level changes
  • A different tail stance
  • Blood spots on bedding

Most female Border Collies exhibit at least one sign of being in heat, but all dogs are different. Some may exhibit multiple signs, while others just one or two. Some will show different signs than others, even if they’re siblings.

divider dog faces oct 2024

How Should a Border Collie Be Cared for While in Heat?

It is important to take special care of your Border Collie while she is in heat to avoid unwanted pregnancies and to ensure her comfort throughout her cycle. Here are several tips that you can use to ensure your dog’s health, happiness, and safety.

1. Don’t Allow Outdoor Time Without Supervision

Even if your yard is fully fenced, you should never let your female Border Collie outdoors without complete supervision while she is in heat. Males that are not confined can detect females in heat, and they will do whatever they can to get to the females they find. Your dog isn’t safe in her own yard while she’s in heat. Your dog might even try to escape in hopes of finding a mate while she is in her estrus stage. Keeping a leash and/or eye on her will help ensure that she doesn’t escape and that other dogs won’t intrude into your property.

Border Collie puppy during obedience training outdoors
Image By: sonsart, Shutterstock

2. Never Allow Off-Leash Exploration

Even if your Border Collie is usually great at staying by your side while outdoors, she should not be trusted when she is in heat. Even when she wants to be good and obey your commands, her hormones can drive her to do the opposite if it means finding a mate to reproduce with. Therefore, you should always keep a leash on your dog whenever you are in public settings, and stay away from dog parks at all costs.


3. Keep Cleaning Supplies Handy

Chances are that things will get a bit messy while your dog is in heat. She is likely to have a bloody discharge that can get on the floor and other items in your home. She may also leave blood spots behind on her bedding and anywhere else she lies down. Therefore, it is a good idea to keep paper towels and disinfectant handy so you can clean the messes as they happen. Some owners prefer to use “doggy diapers” during the heat cycle to keep messes to a minimum.

cleaning materials
Image By: Mironov-Shutterstock

4. Incorporate More Activities into the Day

It is always a good idea to incorporate more activities and “brain games” into her day. Border Collies are active dogs, anyway, so leaving them to their own devices while in heat could spell trouble. Spending time playing fetch, hide-and-seek, and with puzzle toys can help keep your dog busy and distract her from the possible discomforts of her heat cycle.


5. Practice Patience

A Border Collie in heat can have mood swings and behave aggressively toward other animals living in the household. It’s important to practice patience when dealing with unwanted behaviors, as punishing her won’t work and is simply unfair. Her actions are completely normal, and she deserves space and understanding during her heat cycle.

border collie dog resting in a crate
Image By: Ayla Verschueren, Unsplash

divider dog paws oct 2024

In Conclusion

Now that you know when your Border Collie should have her first heat, how often she will go into heat, and the signs to look for that indicate that her heat cycle has arrived, you can plan, prepare, and take proper precautions to ensure that she will have a long, happy, and healthy life. The first few heat cycles can be overwhelming, but things should get easier and more streamlined as time goes on.


Featured Image Credit: Elayne Massaini, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Dog Hobbies: 6 Great Options

If you are a dog lover, you’re probably constantly trying to find ways to incorporate them into your life. Whether you want to...

National Puppy Day 2025: What & When Is It?

Who doesn’t love puppies? Given how cute they are, it isn’t surprising that puppies have their day for celebration. Technically, this day isn’t...

How to Calm a Dog Down in a Car: 10 Vet-Approved Methods

While many dogs enjoy car rides, they may not always be a positive experience for every dog. Some dogs can become too excited...

How Much Do Boston Terriers Drool? Breed Habits & Managing Tips

Whether you’re considering bringing home a Boston Terrier for the first time or have noticed an increase in drooling in your dog, it’s...

More related

Can a Dog Wake Up After Euthanasia? (Vet Answer)

Derived from the Greek words “eu” meaning good and “thanatos” meaning death, euthanasia is the act of humanely and painlessly ending life to...

Can Dogs Eat Sesame Oil? Vet Reviewed Facts & FAQ

Sesame oil is a flavorful oil that has multiple uses. It’s one of the first crop-based oils that humans developed, but it is...

There’s Black Specks in My Dog’s Poop, Should I Worry? Vet-Approved Health Facts

Anytime our dog’s bathroom habits change, it can be pretty scary! Especially if there is a change that could signal something is potentially...

11 Best Eco-Friendly & Sustainable Dog Foods in 2025 – Reviews & Top Picks

Many people are implementing more eco-friendly lifestyles to help take care of our environment and those around us. There is no doubt supporting...

Keep reading

Is Corn in Dog Food Bad? Vet Approved Ingredient Guide

Corn is a controversial ingredient that is used in a lot of commercial dog foods. It is very much a normal dog food ingredient in grain-inclusive diets and has been for quite some time. In fact, according to The Institute...

lots of corn

Can Dogs Eat Almonds? Vet-Verified Health & Nutrition Facts

Human foods can be quite tempting for our pets, and despite our best efforts to keep them put away, sometimes our pups still get into them. While almonds aren’t technically toxic for dogs like some other nuts, they definitely aren’t...

Can Dogs Eat Almonds

Can Dogs Eat Tater Tots? Vet-Approved Facts & FAQ

Chances are that you didn’t feed your dog tater tots on purpose, but if they got into a few that were left out, what should you do? Are tater tots toxic for dogs, and if you do have a few...

Can Dogs Eat_Tater Tots

How Long Will It Take for a Dog to Digest a Bone? Vet-Verified Facts & Risks

Dogs and bones seem like a match made in heaven, but should you be worried if your dog swallows a bone? And can dogs digest a bone if they do eat one? The answer is pretty complicated. Dogs can digest...

red border collie dog chewing on a bone

10 Best Dog Foods for Catahoula Leopard Dogs in 2025 – Reviews & Top Picks

The Catahoula dog breed is beautiful, muscular, and tough. These amazing dogs were originally bred to work in forests and swamps to assist farmers and herders. They are high-energy dogs that stand anywhere from 20 to 26 inches in height...

Catahoula Leopard Dog wearing harness

7 Best Taste of the Wild Dog Foods in 2025 – Reviews & Top Picks

Dogs have always been known for their hearty appetites, and this is especially true of those that are bred to be active. Today, there is an abundance of different types of dog foods on the market, each with its own...

Maltese dog eating from a bowl

11 Best Canned & Wet Puppy Foods in 2025 – Reviews & Top Picks

Bringing home a new puppy can be an overwhelming experience; you are still getting to know their unique personality, how to look after them, and most importantly, learning what to feed them! The quality of the food you choose to...

jack russell terier puppy eating food from bowl

Can Dogs Eat Rotisserie Chicken? Vet-Approved Benefits, Risks, & FAQ

Who can resist the mouthwatering aroma of a perfectly cooked rotisserie chicken? Whether it’s a family gathering, a summer picnic, or a quick and convenient dinner option, rotisserie chicken has become a popular choice for many. But what about our...

Can Dogs Eat_Rotisserie Chicken