Dog Knot: What is it and How Does it Help to Reproduction

Dog knot

Dog knot – The bulbus glandis, also known as knot, or dog knot, is an erectile tissue located at the top of the penis of dogs.  During copulation, this tissue swells and locks up inside the female’s vagina.  When the knot is swollen inside the vagina, this tightens it up to complete the lockup.

This prevents the penis from withdrawing until the dog has ejaculated inside.  The circular muscles also contract, stimulating the ejection of semen.

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The Reproductive Process in Dogs

When a female is in heat and has found the perfect partner, she will become calm and allow the male to mount her.  At this stage, the penis is semi-erect or not erect at all.  The process of mounting is described as the act of the male dog grabbing the female from her ribs.

The male dog then proceeds to position his prepuce behind the proximity of the female’s vulva.  The female elevates her hind quarter and lowers her front quarter.   The copulation begins when the glans has entered the vulva.  The male will then thrust. In some cases, the female will experience discomfort if she is too young or has some reproductive issues.

When the Dog Knot is an Issue

The dog knot becomes an issue when it has lasted 45 to 60 minutes.  When the bulbus glandis is locked with the female’s constrictor vestibuli muscles, they cannot be separated until copulation is over.  This physiological system allows the entirety of the sperm to enter the female’s vagina.

The normal time for ejaculation is around 30 min, time after which both dogs can separate. But in some instances, the knot will not relax, producing pain, trauma, injury, and dog stress.

This unwanted lockup is usually caused by an anatomical defect which should be treated with the veterinarian who will decide if surgery should take place.

Taking care of your pooch is important to his reproductive health.  In Dogalize, we want to help you take good care of your canine friend.  Visit us and check out all the amazing resources we have for you and your best friend.


Image credits: pixabay