Why do Dogs Get Stuck when Mating? - The Answer!

By Josie F. Turner, Journalist specialized in Animal Welfare. November 30, 2017
Why do Dogs Get Stuck when Mating? - The Answer!

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Dog reproduction is a complex process that usually begins with the courtship, in which male and female emit signals to let the other know they are prepared for mating and consequent copulation. Once they have finished mating, we observe that the male dismounts the female but the penis is inside of the vagina, with both dogs still together. It is at this point when we wonder why this happens and if we should separate them or, on the contrary, they do it naturally.

In this AnimalWised article we will respond to these and more questions, solving the cause that explains why dogs get stuck when mating, read on!

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What is the reproductive system of the male dog like

In order to understand why dogs get stuck when mating more easily, it is essential to do a brief review of the anatomy of the reproductive system of the male and the female. Thus, the dog's internal and external apparatus consists of the following parts:

  • Scrotum. This bag is responsible for protecting and maintaining a proper temperature in the dog's testicles. Put in another way, is the visible part of these glands.
  • Testicles. Located in the scrotum, their function is to produce and mature sperm and male hormones such as testosterone. They have an ovulate shape, they are located in a horizontal position and they tend to be symmetrical.
  • Epididymides. Located in both testicles, they are the tubes responsible for storing and transporting sperm to the vas deferens. These tubes are composed of head, body and tail.
  • Vas deferens. It starts at the tail of the epididymis and has the function of transporting the sperm into the prostate.
  • Prostate. Gland that surrounds the neck of the bladder and the beginning of the urethra, and whose size varies from breed to breed. Its function is the generate a substance called prostate fluid or seminal plasma for easy transportation of spermatozoa and nourishes them.
  • Urethra. This conduit not only aims to transport urine from the dog's bladder, but is also part of the canine reproductive system transporting sperm and prostatic fluid for their final ejaculation.
  • Foreskin. It corresponds to the skin covering the penis to protect and lubricate it. The second function of the foreskin is its ability to produce a liquid called smegma, which is greenish, for this purpose.
  • Penis. In normal state it is in the inside of the foreskin. When the dog feels excited, he begins the erection and, consequently, the appearance of the penis is outwards. It consists of the penile bone, which allows penetration, and the penile bulb, a ventral groove which allows the so called "buttoning".
Why do Dogs Get Stuck when Mating? - The Answer! - What is the reproductive system of the male dog like

What is the female reproductive system like

As it is the case with the male apparatus, the female dog's reproductive system consists of internal and external organs, some of them guilty of the fact that dogs get stuck together after mating. Therefore we will briefly explain the function of each of them:

  • Ovaries. With oval form, they have the same function as the testicles in males, to produce ovules and female hormones such as estrogen. As with the male prostate, the size of the ovaries may vary depending on the breed.
  • Oviducts. Tubes in each of the ovaries whose function is the move the egg to the uterine horn.
  • Uterine Horn. Also known as "horns of the uterus", they are two tubes that carry the eggs to the body of the uterus if they have been fertilized by the sperm.
  • Uterus. It is here where the nidation of the zygotes takes place to become embryos, fetuses and, subsequently, puppies.
  • Vagina. Not to be confused with the vulva, the vagina is the internal organ and the vulva the external. In the dog, it lies between the neck of the uterus and the vaginal vestibule, being the place in which the intercourse takes place.
  • Vaginal vestibule. Located between the vagina and the vulva, it allows penetration during mating.
  • Clitoris. As with women, the function of this organ is to produce pleasure or sexual stimulation to the dog.
  • Vulva. As we said, it is the dog's external sex organ, and is resized during the mating period.

But, why do they get stuck after mating?

Once penetration has been produced, the male tends to "dismount" the dog staying attached to it and leading to the owners of both animals to wonder why the dogs have been stuck after mating and how to separate them. This happens because the dog's ejaculation occurs in three phases or fractions:

  1. Urethral fraction. It takes place during the beginning of the penetration, and therein the dog ejects a first liquid free of sperm.
  2. Sperm fraction. After the first ejaculation, the animal completes the erection and starts a second ejaculation, this time with sperm. During this process, there is an increase in penile bulb size due to venous compression of penis and consequent blood concentration. At this point, the male turns around and goes off the female, leaving the dogs stuck.
  3. Prostatic fraction. While the male has already removed the penis from the female, copulation has not ended, as once the dog has turned, the so-called "buttoning" is produced by the expulsion of the third ejaculation, with a much lower number of sperm than the last. Once the bulb relaxes and recovers its normal state, the dogs are unstuck.

In total, the intercourse can last 20 to 60 minutes, 30 being the usual average.

This way, and once the three phases of the ejaculation of the male have been reviewed, we see how the cause that gives us the answer to the question of why dogs get stuck when mating is the expansion of the penile bulb. Such is the size that it reaches, that it cannot pass through the vaginal vestibule, which closes precisely to ensure this fact and avoid damage to the female.

Why do Dogs Get Stuck when Mating? - The Answer! - But, why do they get stuck after mating?

Should I get two dogs to unstick after mating?

Clearly not. The dog's female and male anatomy do not allow removal of the penis before the end of the dog's third ejaculation. If you separate them forcefully, both animals would be wounded and harmed, and intercourse would not come to its end. During this phase, it should be the animals that carry out their natural mating process, allowing them a relaxed and comfortable atmosphere.

It is common to hear the female issue sounds similar to crying and, even, growls or barks, however, and despite the fact that it can lead to their fellow human beings to consider that they need to separate them from the male, the most advisable is not to boost their stress levels and , as we say, let themselves separate from each other.

Once the intercourse has ended, if the eggs have been fertilized and the dog gets pregnant, it will be necessary to provide her with a series of care, so we recommend the following articles:

If you want to read similar articles to Why do Dogs Get Stuck when Mating? - The Answer!, we recommend you visit our Facts about the animal kingdom category.

  • VALERA, M.A. canine reproduction. Centaur veterinary polyclinic. Alcorcón.
  • GRADIL, C. M.; YEAGER, A.; CONCANNON, P.W. 2006. Assessment of of the canine male reproductive problems. IVIS.
  • XIOMARA, l. extraction seminal in the dog. Department of medicine and Animal surgery, obstetrics and reproduction of the Clinical Veterinary Hospital in Murcia. Murcia.

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Jopestkil Kenya pest
Unexplainably complex.
David Stephenson
Listen, this is the easiest thing to fix. The male dogs penis is anchored under the base of his tail. If you place your thumb and first finger either side of the base of his tail, you will feel the blood pulsing into the penis. Just slowly press and pinch your fingers down and firmly together and close off the blood supply. The male dog's penis will deflate and the dogs will immediately separate.
Amazing to know this.
Administrador AnimalWised
Yes Jacqueline,

It's definitely an odd behavior when you come across it and not much less odd when you know what's happening!
That is how they were created and that is their nature
Quite interested what I've just read,have learned something on dogs that would make me curious to always watch them when they matting....
This has finnaly answered my question of why dogs really get stuck together. I've always asked myself in the last but just knowing that the penis gets too big to pass wasn't enough of an answer. Because there's pretty much always a reason in the evolutions of animals and their behaviour.
I would still however, to know if the female dog DOES experience pain during the third ejaculation. As always it seems the female is in a lot of pain.
Also to learn that the female also has a clitoris, does that mean that the female senses pleasure too??
Would love to know the answers to those.
Administrador AnimalWised
Hi Shane,

As with humans, dogs can experience some pain during sex, especially if it is the first time. Yelping is, however, normal and shouldn't cause concern, so it may seem they are in pain when they are not. It is natural and the ‘stuck together’ stage doesn't seem to cause any undue pain unless they are force apart. All mammal species exhibit a clitoris, but research on non-human subjects is relatively scant. We can see that it is possible they do have an orgasm as the contractions can aid insemination. Males masturbate for pleasure, so it is likely females will also sense pleasure to encourage procreation. Further research, however, is needed for conclusive proof. Hope this helps!

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