A dog lover, whose dog was a female and 'in heat',

agreed to look after her neighbour's male dog while the neighbours were on vacation.
She had a large house and believed that she could keep the two dogs apart. However, as she was drifting off to sleep she heard awful howling and moaning sounds, rushed downstairs and found the dogs locked together, in obvious pain and unable to disengage, as so frequently happens when dogs mate.
Unable to separate them, and perplexed as to what to do next, although it was late, she called the vet, who answered in a very grumpy voice.
After she explained the problem to him, the vet said, "Hang up the phone and place it down alongside the dogs. I will then call you back and the noise of the ringing will make the male lose his erection and he will be able to withdraw."
"Do you think that will work?" she asked.
"Just worked on me," he replied.

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ThePatientAnarchist · 61-69

Great joke, but is that true about dogs mating?

Rusham · M

Absolutely true. BUT I had to use AI to verify. @ThePatientAnarchist

Yes, it is true that dogs can become "knotted" or "tied" during mating. This is a normal and natural part of the canine reproductive process.
The "knot" is a biological feature called the bulbus glandis, a specialized erectile tissue at the base of the male dog's penis. After the male penetrates the female, this tissue swells significantly. The female's vaginal muscles then contract around the swollen tissue, physically locking the two dogs together. This "tie" can last anywhere from a few minutes to up to an hour. Its purpose is to ensure that the semen is securely deposited inside the female, increasing the chance of successful fertilization and preventing other males from mating with her immediately afterward.
Is there a specific aspect of this process you're curious about, such as why it happens, how long it lasts, or what to do if you witness it?