How Long Do Dogs' Periods Last?

Just like humans, female dogs experience reproductive cycles, but they look and behave quite differently. If you're a dog owner wondering, “How long does my dog's period last?” — you’re not alone. Understanding your dog's heat cycle can help you better support her health and comfort.

In this article, we'll break down how long dogs' periods typically last, what signs to watch for, and when you might need to book a vet consultation.

What Is a Dog’s Heat Cycle?

• In dogs, the “period” refers to the estrus stage of their reproductive cycle.
• It's the time when a female dog is fertile and can become pregnant.
• Unlike humans, dogs don't menstruate in the same way — instead, they discharge blood during heat.

The full reproductive cycle in dogs includes four stages:

• Proestrus (starting stage – bloody discharge begins)
• Estrus (fertile period)
• Diestrus (end of fertility)
• Anestrus (rest period before the next cycle)

How Long Does a Dog’s Period Last?

On average, a dog’s "period" (proestrus and estrus combined) lasts about 2 to 4 weeks.

Here’s a simple breakdown:

• Proestrus (bleeding starts): around 7–10 days
• Estrus (fertile window): around 5–10 days

Total period length:

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✅ Most dogs experience bleeding and discharge for 2 to 3 weeks.

Important: The exact duration can vary based on the dog's breed, age, and size.

Breed Size Influence:

• Small breeds: often have shorter periods (2 weeks)
• Large breeds: may bleed for closer to 3–4 weeks

Signs Your Dog Is in Heat

Keep an eye out for these common symptoms:

• Swollen vulva (often the first visible sign)
• Bloody discharge (ranging from light pink to red)
• Increased urination (marking territory)
• Behaviour changes (more affectionate or sometimes irritable)
• Flagging (lifting the tail to attract males)

How Often Do Dogs Get Their Periods?

Most dogs go into heat about twice a year, every 6 to 8 months.
Some small breeds may cycle every 4 months, while giant breeds may only have one cycle per year.

First period?

• Dogs usually have their first heat at around 6 to 15 months of age, depending on the breed.

How Can You Help Your Dog During Her Period?

Here are some simple ways to make your dog more comfortable:

• Use doggie diapers to manage bleeding indoors
• Limit outdoor walks to prevent unwanted mating
• Offer extra cuddles if she's feeling needy or stressed
• Keep her clean with gentle wiping and grooming
• Monitor for any health concerns like excessive bleeding or lethargy

When Should You Call a Vet?

While most heat cycles are normal, book a vet consultation if you notice:

• Extremely heavy bleeding
• Bleeding lasting longer than 4 weeks
• Signs of infection (pus-like discharge, bad smell)
• Severe behavioural changes
• Loss of appetite or energy

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Our vets at Dial A Vet are available online for just $49.
Book a consultation here.

Can You Prevent Dogs From Going Into Heat?

Yes — desexing (spaying) prevents dogs from going into heat altogether.
Benefits of desexing:

• Prevents unwanted pregnancies
• Reduces risk of certain cancers (like mammary tumours)
• Helps manage behavioural issues

Speak to your vet about the best time to spay your dog.

Summary

Quick Facts About Dog Periods:

Average duration: 2–4 weeks

Bleeding stage (Proestrus): 7–10 days

Fertile stage (Estrus): 5–10 days

Frequency: about twice a year

First heat: around 6–15 months old

Being aware of your dog’s heat cycle is part of being a responsible pet owner. If you’re ever unsure whether your dog's symptoms are normal, it’s always better to seek professional advice.

✅ Book a $49 vet consultation today with Dial A Vet — we're here to help!

FAQs

How long does a dog bleed while in heat?

Dogs usually bleed for around 7 to 10 days, but light spotting can last a little longer.

Can a dog get pregnant while bleeding?

Yes. Even while bleeding, dogs can become pregnant during the fertile window.

Do dogs have periods after being spayed?

No. Spayed dogs no longer experience heat cycles or periods.

Is it normal for a dog’s period to last longer than 4 weeks?

No — if bleeding persists past 4 weeks, it's important to consult a vet.

How can I manage my dog’s bleeding indoors?

Use specially designed doggie diapers, lay down washable blankets, and keep her bedding clean.

References

• RSPCA Australia. (n.d.). Desexing your pet. https://www.rspca.org.au
• Animal Medicines Australia. (2021). Pets in Australia: A national survey. https://animalmedicinesaustralia.org.au
• Australian Veterinary Association. (n.d.). Heat cycles in dogs. https://www.ava.com.au

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