Understanding the Silent Heat in Female Dogs

Updated on November 6, 2018
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Adrienne is a certified dog trainer and behavior consultant, former veterinarian assistant and author of "Brain Training for Dogs."

What causes a silent heat in dogs?
What causes a silent heat in dogs? | Source

Understanding Silent Heat in Dogs

So you have been waiting anxiously for your dog to go into heat. It could be you were planning to breed her this time, or you simply wanted to get her spayed right after the heat. It could also be that you just wanted to be prepared so you could take all the necessary precautions that should always be taken by owners who choose to keep their female dogs intact.

So you are familiar with your dog's heat cycle. You know how often in general it happens and you know how to recognize the signs of proestrus. So six months go by and nothing happens. As the seventh months flies by you start scratching your head. What happened? Did you miss it? Is your dog's heat cycle going bonkers? Did she skip her heat or is it late? In the next paragraph we will talk about silent heats in female dogs.

Dog silent heat
Dog silent heat | Source

So What Would Cause a Silent Heat?

Often veterinarians who specialize in reproductive health are questioned by owners just as puzzled as you. More often than not, the dog most likely went in heat and the owner just didn't notice it. Okay, you may say, the owner may have not noticed, but what about all the male dogs? Shouldn't they have been showing at least some interest? What about the trails of males in adoration waiting behind the front door? Following are some causes of what dog owners refer to as "silent heats".

Lack of Signs

Yes, your dog may have simply given off little signs of going into heat you may have not caught. Don't take it personally; it happens. As mentioned, countless vets are contacted for the same very problem. If you were not planning to breed, count your blessings; many owners would have wished a silent heat so they did not have to deal with all the annoying cleaning and cranky behaviors associated with it. But how could you have missed it? Some dogs are fastidiously clean and will readily lick off any signs of evidence, so the bloody discharge may have never made it to the floor. Other dogs simply don't bleed much at times, these "dry heats" are not abnormal. If you are planning to breed your dog, don't rely on the presence of blood alone!

Aggressive Behavior

OK, so you may have missed your dog's heat cycle, but what about the other male dogs? Aren't other dogs supposed to smell a female in heat from a distance and go bonkers over it? How could your neighbor's male dog care less? At times, some female dogs who are aggressive towards males and a bit on the assertive side, may discourage them from showing any interest. If your dog doesn't seem to match this type, read on for more causes of silent heats.

Medical Conditions

At times, what looks like a silent heat is actually a missing heat. If about 10 months have passed and your dog didn't go into heat, it could be you have missed the signs, but it could also very well be that your dog really didn't go into heat. Keep in mind that this can happen and at times this can be due to some medical problems. Possible conditions capable of causing a lack of heat include hypothyroidism, hyperadrenocorticism, hypoadrenocorticism, diabetes mellitus and cancer explains veterinarian Mike Richards.

Dog Breed

So you are used to seeing a female dog cycle every 6 to 7 months? Well, forget this guideline if you are first-time Basenji or Tibetan Mastiff dog owner. These breeds tend to cycle once a year so you know there's nothing really wrong with these fellows if they are not showing any estrus signs twice a year.

Now what? So if your dog didn't go into heat, and she's not a basenji and doesn't seem to be planning going into heat soon, then your next step is to have your dog seen by a vet. Have the vet rule out any medical problems. Your vet may then decide to check on your dog's progesterone levels to have some idea of what may be going on. If your dog did undergo a silent heat, her progesterone levels would still be high enough to prove that. Weekly cytology tests may provide an insight on the chances for an estrus cycle nearing or signs that nope, there's not going to be any future cycle in the near future.

Interestingly, if your dog is late in her heat and you're concerned, housing her with another intact female who is approaching proestrus may help. There are many cases, where a cycling dog may induce heat in another female dog living alongside.


This article is accurate and true to the best of the author’s knowledge. It is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from a veterinary medical professional. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

Questions & Answers

  • I have an almost 11 month old German Shepherd. We are planning on breeding her for future service dogs; however, she hasn't gone into heat yet. Is this normal? If not, could the 2 UTIs she’s had have disrupted her heat?

    One possibility is that the burning sensation of the UTI is causing her to lick. Therefore, if she is in heat, she’d lick away any discharge, causing you to miss the signs of heat. Although not very common, some dogs may go into heat as late as 12-14 months old. You might consider having a progesterone level done, as well as consulting with a theriogenologist.

© 2013 Adrienne Janet Farricelli

Comments

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    • profile image

      Charlotte 

      2 months ago

      My dog is 6 years old and she has never bleed.

    • profile image

      Dude 

      5 months ago

      What if there was no blood but a gooey kind of clear kinda green discharge what does that mean.

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