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the Heat Cycle of Female Dogs

Understanding a female's heat cycle can help you prepare for a breeding or prevent an unwanted litter. Find out how the cycle works and how to spot when a female is coming into season.

The Heat Cycle


When a female comes into "heat" or "season," her body is preparing for breeding and the possibility of producing a litter. According to the University of Georgia College of Veterinary Medicine, the cycle is broken into stages.
  • Proestrus - This stage typically lasts about nine days, and it's marked by an increase in a female's estrogen level. She won't be receptive to a male's advances just yet, but she will show many of the signs of heat listed below.
  • Estrus - During this stage which also lasts about nine days, estrogen levels drop while progesterone levels rise. The female will begin ovulating during this stage, which means a series of eggs will be released from her ovaries and become available for fertilization. She will now begin to be receptive to a male's attempts to breed her.
  • Diestrus - This stage lasts about two months. Progesterone levels are still elevated, but the female will no longer be receptive to a male's attempts to breed with her.
  • Anestrus - This is the resting stage that lasts until the female comes into heat again.
Age When Heat Commences
While it is not a hard rule, most females come into their first heat cycle around six months of age, although some females wait as long 12 to 18 months old. Very large breed females may begin cycling as late as 24 months old.

Frequency of Cycles
While many females will hold to a fairly steady schedule of coming into season about every six months, it can vary. Some girls will only come into heat once year, while others may even come into season every four months. However, these "extra" seasons are not always fertile. Once a female has her first season, you can track subsequent cycles to determine what her natural pattern will be.

Signs a Female Is in Heat
Common signs that you can expect to see when a female is in season include:
Mood change - Some females show a change in mood shortly before their season commences, and they may even act a bit touchy. Think of it as the doggie equivalent of PMS.
Swollen nipples - Sometimes, but not always, the nipples and breasts will swell slightly. This can also be a sign of a phantom pregnancy, when a female may begin to show signs of being pregnant even if she's not. So, watch if this happens, but it usually resolves itself in a few weeks after the cycle ends.
Sudden interest from males - Males are great early warning detectors and can smell the change in a female's hormones before she fully comes into heat.
Swollen vulva - The vulva can show some swelling, but it is quite variable, some girls hardly swell at all, while others swell up like a golf ball.
Tail flagging - When a female is ready to be bred, she'll usually stand quite still while the male investigates her vulva. She'll hold her own tail up and wag it side to side to make sure he catches the scent.
Blood discharge - This is usually the surest indicator the heat cycle has begun, with a pinkish red-colored discharge the first week that usually turns to a tannish color during the fertile period, and then changes back to a reddish color before gradually stopping altogether. Some females keep themselves extremely clean, and it may be difficult to tell if they are in season at all.

Caring for Your Female While She's in Heat
Caring for your female while she's in heat is relatively simple.
Keep a close eye on her. This is mainly to protect her from an unwanted breeding because males can detect the scent of a female in heat from some distance away, and they'll travel from blocks away to find her.
Be extra patient and gentle with her. She may feel a little under the weather during the proestrus stage.
Avoid bathing her until she completely stops discharging. That way you can figure her cervix is closed again, and she'll be less likely to develop a vaginal/uterine infection from the bath water.
If you've determined your female's regular heat cycle pattern and you intend to breed her, have her checked for brucellosis prior to her next heat cycle, and request that the stud dog owner has the male checked as well. Brucellosis is a bacterial infection that is sexually transmitted between males and females, and it can cause infertility in both sexes.
Always Good to Know

You may never breed your female, but it's still a good idea to have a basic understanding of heat cycles so you know what she's going through. If you want to eliminate all possibility that she'll ever have a litter, you can ask your veterinarian to spay her for you. That way you'll never have to deal with her heat cycle again.
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