How old does a dog have to be to go into heat, and how long does it usually last?

I’ve noticed some changes in my young dog’s behavior recently, and I suspect she might be going into heat. I'm unsure how old dogs typically are when this starts happening. Could you tell me at what age they usually go into heat and how long this period typically lasts? I'm trying to prepare and make sure I’m caring for her properly during this time.

Answer

It's perfectly natural to be concerned about changes in your dog's behavior, especially if you suspect she is entering her first heat cycle. Typically, female dogs experience their first heat between 6 and 24 months of age.

  • Dogs usually go into heat for the first time between 6-24 months.
  • The heat cycle generally lasts 2-4 weeks.
  • Behavioral changes can include increased affection, restlessness, and marking territory.

When female dogs go into heat, it’s their body’s way of preparing for potential mating and pregnancy. The first heat cycle can occur as early as 6 months, but for some larger breeds, it might not happen until 18-24 months. During this time, you may notice your dog becoming more affectionate, anxious, or craving more attention. Additionally, she may start marking her territory more frequently. The heat cycle usually lasts between 2-4 weeks, and it is essential to be extra cautious about her being outdoors without supervision to prevent unintended mating.

Book a consultation with a licensed vet at Dial A Vet for just $49 AUD if you're unsure or symptoms are getting worse.

Frequently Asked Questions

  • How can I tell if my dog is in heat?

    Signs of heat in dogs include swelling of the vulva, a blood-tinged discharge, more frequent urination, and behavior such as increased attentiveness or agitation.

  • How often do dogs go into heat?

    Most dogs go into heat every six months, but this can vary depending on the breed and individual dog, with some going into heat every four months, while others may have a longer interval.

  • Should I spay my dog, and when is the best time?

    Spaying is often recommended to prevent unwanted pregnancies and certain health issues. Ask your vet about the optimal time to spay, which can depend on the dog’s breed, size, and health.

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